siemens s7-300

INDUSTRIAL AUTOMATION TRAINING

SIEMENSS7-300 PROGRAMMING

IN STATEMENT LIST

CONTENTS: PAGE NO

1. STEP7 OVERVIEW 3

2. COMPARISON OF CPU's AND MODULES AVAILABLE 7

3. ADDRESSING OF MODULES 9

4. LOAD MEMORY AND WORK MEMORY 12

5. BLOCKS IN THE USER PROGRAM 13

6. DATA TYPES 14

7. STATEMENT LIST PROGRAMMING 16

8. BIT LOGIC INSTRUCTIONS 23

9. COMPARISON INSTRUCTIONS 27

10.CONVERSION INSTRUCTIONS 29

11.COUNTER INSTRUCTIONS 38

12.DATA BLOCK AND LOGIC CONTROL INSTRUCTIONS 45

13.LOAD AND TRANSFER INSTRUCTIONS 48

14.FLOATING POINT MATH INSTRUCTIONS 49

15. INTEGER MATH INSTRUCTIONS 51

16.PROGRAM CONTROL INSTRUCTIONS 54

17.SHIFT INSTRUCTIONS 56

18.TIMER INSTRUCTIONS 58

19.WORD LOGIC INSTRUCTIONS 71

20.ACCUMULATOR INSTRUCTIONS 73

21.PROGRAMMING EXAMPLES 75

22.GLOSSARY 86

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SIMATIC S7

PLC RANGE

S7-400 HIGH END RANGE/MEDIUM RANGE

S7-300 MID AND LOW END PERFORMANCE RANGE

S7-200 MICRO PLC'S

SIMATIC S7-300 COMPONENTS

S.No. COMPONENT FUNCTION

1. Rail Accomodates the S7-300 modules

2. Power Supply (PS) Converts the power system voltage (120/230VAC) into 24VDC for the S7-300 and load power supply for 24 VDC load circuits.

3. CPU Executes the user program, provides the 5V supplyFor the S7-300 backplane bus, communicates with other CPU's or with a programming device via the MPI(Multi Point Interface).

4. Signal Modules(SM)- DI,DO,AI,AO

Match different process signal levels to the internal signal level of S7-300

5. Function Modules (FMs) For time critical and memory intensive process signal processing tasks eg. Closed loop control

6. Communication Processor (CP)

Relieves the CPU of communication tasks eg-CP 342-5 DP for connection to SINEC L2-DP.

7. Interface Module(IM) Interconnects the individual tiers of an S7-300

8. Sinec L2 cable with LAN connector

Interconnects CPUs and PCs

9. Programmer Cable Connects a CPU to a programming device

10. RS 485 Repeater Interfaces the S7-300 over large distances to other S7-300s or programming devices

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Overview of STEP 7

What is STEP 7? STEP 7 is the standard software package used for configuring and programming

SIMATIC programmable logic controllers. It is part of the SIMATIC industry software.

Basic Tasks When you create an automation solution with STEP 7, there are a series of basic tasks. The following figure shows the tasks that need to be performed for most projects and assigns them to a basic procedure.

Alternative Procedures As shown in the figure above, you have two alternative procedures:

You can configure the hardware first and then program the blocks. You can, however, program the blocks first without configuring the hardware. This is

recommended for service and maintenance work, for example, to integrate programmed blocks into in an existing project.

Brief Description of the Individual Steps

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Installation and authorization The first time you use STEP 7, install it and transfer the authorization from diskette to the hard disk

Plan your controller Before you work with STEP 7, plan your automation solution from dividing the process into individual tasks to creating a configuration diagram Design the program structure Turn the tasks described in the draft of your controller design into a program structure using the blocks available in STEP 7

Start STEP 7 You start STEP 7 from the Windows 95/98/NT user interface

Create a project structure A project is like a folder in which all data are stored in a hierarchical structure and are available to you at any time. After you have created a project, all other tasks are executed in this project Configure a station When you configure the station you specify the programmable controller you want to use; for example, SIMATIC 300, SIMATIC 400

Configure hardware When you configure the hardware you specify in a configuration table which modules you want to use for your automation solution and which addresses are to be used to access the modules from the user program. The properties of the modules can also be assigned using

Configure networks and communication connections The basis for communication is a pre-configured network. For this, you will need to create the subnets required for your automation networks, set the subnet properties, and set the network connection properties and any communication connections required for the networked stations

Define symbols You can define local or shared symbols, which have more descriptive names, in a symbol table to use instead of absolute addresses in your user program

Create the program Using one of the available programming languages create a program linked to a module or independent of a module and store it as blocks, source files, or charts

S7 only: generate and evaluate reference data You can make use of these reference data to make debugging and modifying your user program easier

Configure messages You create block-related messages, for example, with their texts and attributes. Using the transfer program you transfer the message configuration data created to the operator interface system database (for example, SIMATIC WinCC, SIMATIC ProTool)

Configure operator control and monitoring variables You create operator control and monitoring variables once in STEP 7 and assign them the required attributes. Using the transfer program you transfer the operator control and monitoring variables created to the database of the operator interface system WinCC

Download programs to the programmable controller S7 only: after all configuration, parameter assignment, and programming tasks are completed, you can download your entire user program or individual blocks from it to the programmable controller (programmable module for your hardware solution).

Test programs S7 only: for testing you can either display the values of variables from your user program or a CPU, assign values to the variables, and create a variable table for the variables that you want to display or modify

Monitor operation, diagnose hardware You determine the cause of a module fault by displaying online information about a module. You determine the causes for errors in user program processing with the help of the diagnostic buffer and the stack contents. You can also check whether a user program can run on a particular CPU

Document the plant After you have created a project/plant, it makes sense to produce clear documentation of the project data to make further editing of the project and any service activities easier

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COMPARISON OF CPU'S

CPU's CPU312IFM CPU313 CPU314IFM CPU314

Mem Statement/Bytes 2K/6KB 4K/12KB 8K/24KB 16K/48KBMemory Cards - 512KB

FEPROM- 512KB

FEPROMProcessing Time 1024 Statements

0.6 ms 0.6 ms 0.3 ms 0.3 ms

DI & DO Max 256 256 1024 1024AI & AO Max 64 64 256 256Rack Configuration 1-Tier 1-Tier 4-Tier 4-TierExpansion Modules Max 8 8 31 31Bit Memories 1024 2048 2048 2048Counters 32 32 64 64Timers 64 64 72 128MPI Interface187.5 Kbit/sMax 32 Nodes

Yes Yes Yes Yes

Integrated functions+Interfaces

10DI/6DQ onboard. int. functions:Counters/Freq. Measuremensts

- 20DI/16DQ ,4AI,1AO onboard. int. functions:Counters/Freq. Measuremensts/Positioning PID Control

-

CPU's CPU315 CPU315-2DP CPU316-2DP CPU318-2

Mem Statement/Bytes 16K/48KB 16K/48KB 42K/128KB 256KBMemory Cards 512KB FEPROM 512KB

FEPROM4MB FEPROM

4MB FEPROM

Processing Time 1024 Statements

0.3 ms 0.3 ms 0.3 ms 0.1 ms

DI & DO Max 1024 2048 4096 16384AI & AO Max 256 256 256 1024Rack Configuration 4-Tier 4-Tier 4-Tier 4-TierExpansion Modules Max 32 32 32 32Bit Memories 2048 2048 2048 8192Counters 64 64 64 512Timers 128 128 128 512MPI Interface187.5 Kbit/sMax 32 Nodes

Yes Yes Yes Upto 12Mbaud

Integrated functions+Interfaces

- PROFIBUS-DP Master/Slave (64 DP stations,12Mbaud)

PROFIBUS-DP Master/Slave (64 DP stations,12Mbaud)

PROFIBUS-DP Master/Slave (125 DP stations,12Mbaud)

* 1 K statements correspond to approx. 3Kbytes of user memory.

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THE DIFFERENT TYPES OF MODULES AVAILABLE ARE

1. SIGNAL MODULES - FOR DIGITAL AND ANALOG SIGNALS

DIGITAL INPUTS DIGITAL OUTPUTS

16 X 24 VDC 8 X 120 / 230 VAC 16 X 120 V AC 32 X 24 V DC

16 x 24 VDC ,0.5A 8 X 24 VDC ,2A 8 X 120 / 230 VAC, 2A 16 X 120 VAC, 1A 32 X 24 V DC, 0.5A

RELAY OUTPUTS DI/DO MODULES

8 X Relay 30 VDC ,0.5A 8 X Relay 250 VAC ,3A 16 X Relay 30VDC,0.5A 16 X Relay 120VAC, 2.5A

8DI/8DO X 24VDC 0.5A

ANALOG INPUTS PARAMETERIZABLE ANALOG OUTPUTS PARAMETERIZABLE

8 Analog Inputs/ 2 Analog Inputs +/- 10V , +/- 50 mV, +/-1 V, +/-20 Ma, 4 to

20mA, Pt100, Thermocouple

4 Analog Outputs/ 2 Analog Outputs +/-10V, +/-50mV, +/-1 V, +/-20 mV, 4 to 20

mA

2. FUNCTION MODULES High Speed Counter Modules - Upto 100 KHz range Positioning Modules - For position control, Stepper Motor Control, Cam Controllers

All function modules are enclosed and can be installed in any slot.

3. COMMUNICATION PROCESSORS - FOR DATA EXCHANGE WITH PRINTERS,COMPUTERS, SIMATIC SYSTEMS

CP340 - Point to Point Communication for the serial link with RS232, 3964R and any ASCII protocol

4. INTERFACE MODULES - FOR MULTI TIER CONFIGURATION For Central Controller Expansion For Expansion Unit Connection

5. POWER SUPPLY MODULES - FOR 24 VDC LOAD CIRCUITS WITH DIFFERENT RATINGS.

MPI - MULTI POINT INTERFACE FOR COMMUNICATION

MPI INTEGRATED IN CPU DATA EXCHANGE RATE : 187.5 Kbits / s SIMULTANEOUS COMMUNICATION WITH PG/PC/OP(OPERATOR PANEL) AND FURTHER

PLCS REQUIRING NO ADDITIONAL HARDWARE UPTO 32 NODES CAN BE CONNECTED

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ADDRESSING OF MODULES

PAGE 8

6

8

288

7

12

304

8

16

320

9

20

336

10

24

352

11

28

368

5

4

272

PS

Slot Number 1 2 3

Digital Address

Analog Address

RACK 0

Module Starting Addresses of the Signal Modules on Rack 0

Slot Addressing for Rack 0

CPU

4

64

512

6

40

416

7

44

432

8

48

448

9

52

464

10

56

480

11

60

496

5

36

400

4

32

384

Slot Number 3

Digital Address

Analog Address

RACK 1



CPU IM AI / AO / DI / DO Modules

4

0

256

4

64

512

6

72

544

7

76

560

8

80

576

9

84

592

10

88

608

11

92

624

5

68

528

4

64

512

Slot Number 3

Digital Address

Analog Address

RACK 2



4

64

512

6

104

672

7

108

688

8

112

704

9

116

720

10

120

736

11

124

752

5

100

656

4

96

640

Slot Number 3

Digital Address

Analog Address

RACK 3



CPU IM AI / AO / DI / DO Modules

4

64

512

6 7 8 9 10 1154Slot Number IM

Rack 3

4

64

512


Rack 2

Connecting cable 368

4

64

512


Rack 1

Connecting cable 368

6 7 8 9 10 115

PS

Slot Number 1 2 (IM) 3

CPU

4

Rack 0

Load Memory and Work Memory in the CPU After completing the configuration, parameter assignment, and program creation and establishing the online connection, you can download complete user programs or individual blocks to a programmable controller. To test individual blocks, you must download at least one organization block (OB) and the function blocks (FB) and functions (FC) called in the OB and the data blocks (DB) used. To download the system data created when the hardware was configured, the networks configured, and the connection table created to the programmable controller, you download the object “System Data". You download user programs to a programmable controller using the SIMATIC Manager, for example, during the end phase of the program testing or to run the finished user program. Relationship - Load Memory and Work Memory The complete user program is downloaded to the load memory; the parts relevant to program execution are also loaded into the work memory.

CPU Load Memory The load memory is used to store the user program without the symbol table and the

comments (these remain in the memory of the programming device). Blocks that are not marked as required for startup will be stored only in the load memory. The load memory can either be RAM, ROM, or EPROM memory, depending on the

programmable controller.

CPU Work Memory The work memory (integrated RAM) is used to store the parts of the user program required for program processing. Possible Downloading/Uploading Procedures You use the download function to download the user program or loadable objects (for example, blocks) to the programmable controller. If a block already exists in the RAM of the CPU, you will be prompted to confirm whether or not the block should be overwritten.

You can select the loadable objects in the project window and download them from the SIMATIC Manager (menu command: PLC > Download).

When programming blocks and when configuring hardware and networks you can directly download the object you were currently editing using the menu in the main window of the application you are working with (menu command: PLC > Download).

Another possibility is to open an online window with a view of the programmable controller (for example, using View > Online or PLC > Display Accessible Nodes) and copy the object you want to download to the online window.

Alternatively you can upload the current contents of blocks from the RAM load memory of the CPU to your programming device via the load function.

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Blocks in the User Program

The STEP 7 programming software allows you to structure your user program, in other words to break down the program into individual, self-contained program sections. This has the following advantages:

Extensive programs are easier to understand. Individual program sections can be standardized. Program organization is simplified. It is easier to make modifications to the program. Debugging is simplified since you can test separate sections. Commissioning your system is made much easier.

The example of an industrial blending process illustrated the advantages of breaking down an automation process into individual tasks. The program sections of a structured user program correspond to these individual tasks and are known as the blocks of a program. Block Types There are several different types of blocks you can use within an S7 user program:

Block Brief Description Of FunctionOrganization blocks (OB) OBs determine the structure of the user program.

System function blocks (SFB) and system functions (SFC)

SFBs and SFCs are integrated in the S7 CPU and allow you access to some important system functions.

Function blocks (FB) FBs are blocks with a "memory" which you can program yourself.

Functions (FC) FCs contain program routines for frequently used functions.

Instance data blocks (instance DB)

Instance DBs are associated with the block when an FB/SFB is called. They are created automatically during compilation.

Data blocks (DB) DBs are data areas for storing user data. In addition to the data that are assigned to a function block, shared data can also be defined and used by any blocks.

OBs, FBs, SFBs, FCs, and SFCs contain sections of the program and are therefore also known as logic blocks. The permitted number of blocks per block type and the permitted length of the blocks is CPU-specific.

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DATA TYPES Introduction to Data Types and Parameter Types All the data in a user program must be identified by a data type. The following data types are available:

Elementary data types provided by STEP 7 Complex data types that you yourself can create by combining elementary data types Parameter types with which you define parameters to be transferred to FBs or FCs

General Information Statement List, Ladder Logic, and Function Block Diagram instructions work with data objects of specific sizes. Bit logic instructions work with bits, for example. Load and transfer instructions (STL) and move instructions (LAD and FBD) work with bytes, words, and double words. A bit is a binary digit "0" or "1." A byte is made up of eight bits, a word of 16 bits, and a double word of 32 bits. Math instructions also work with bytes, words, or double words. In these byte, word, or double word addresses you can code numbers of various formats such as integers and floating-point numbers. When you use symbolic addressing, you define symbols and specify a data type for these symbols (see table below). Different data types have different format options and number notations. This chapter describes only some of the ways of writing numbers and constants. The following table lists the formats of numbers and constants that will not be explained in detail. Format Size in Bits Number Notation

Hexadecimal 8, 16, and 32 B#16#, W#16#, and DW#16#

Binary 8, 16, and 32 2#

date 16 D#

time 32 T#

Time of day 32 TOD#

Character 8 'A'

Elementary Data Types Each elementary data type has a defined length. The following table lists the elementary data types.

Type and Description

Size in Bits

Format Options Range and Number Notation (lowest to highest value)_

Example

BOOL(Bit) Boolean text TRUE/FALSE TRUE

BYTE (Byte)

8 Hexadecimal number

B16#0 to B16#FF L B#16#10 L byte#16#10

WORD (Word)

16

Binary number

Hexadecimal number

BCD Decimal number unsigned

2. 0 to 2#1111_1111_1111_1111 W#16#0 to W#16#FFFF

C#0 to C#999 B#(0.0) to B#(255.255)

L 2#0001_0000_0000_0000

L W#16#1000 L word16#1000 L C#998 L B#(10,20) L byte#(10,20)

DWORD (Double word)

32 Binary number

Hexadecimal number

2#0 to 2#1111_1111_1111_1111 1111_1111_1111_1111 DW#16#0000_0000 to DW#16#FFFF_FFFF

2#1000_0001_0001_1000_ 1011_1011_0111_1111

L DW#16#00A2_1234 L dword#16#00A2_1234

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Decimal number unsigned B#(0,0,0,0) to B#(255,255,255,255)

L B#(1, 14, 100, 120) L byte#(1,14,100,120)

INT (Integer)

16 Decimal number signed -32768 to 32767 L 1

DINT (Integer, 32 bits)

32 Decimal number signed L#-2147483648 to L#2147483647

L L#1

REAL (Floating-point number)

32 IEEE Floating-point number

Upper limit: 3.402823e+38 Lower limit: 1.175 495e-38

L 1.234567e+13

S5TIME (SIMATIC time)

16 S7 time in steps of 10 ms (default)

S5T#0H_0M_0S_10MS to S5T#2H_46M_30S_0MS and S5T#0H_0M_0S_0MS

L S5T#0H_1M_0S_0MS L S5TIME#0H_1H_1M_0S_0MS

TIME (IEC time)

32 IEC time in steps of 1 ms, integer signed

-T#24D_20H_31M_23S_648MS to T#24D_20H_31M_23S_647MS

L T#0D_1H_1M_0S_0MS L TIME#0D_1H_1M_0S_0MS

DATE (IEC date)

16 IEC date in steps of 1 day D#1990-1-1 to D#2168-12-31

L D#1996-3-15 L DATE#1996-3-15

TIME_OF_DAY (Time)

32 Time in steps of 1 ms TOD#0:0:0.0 to TOD#23:59:59.999

L TOD#1:10:3.3 L TIME_OF_DAY#1:10:3.3

CHAR (Character)

8 ASCII characters 'A','B' etc. L 'E'

Parameter Types In addition to elementary and complex data types, you can also define parameter types for formal parameters that are transferred between blocks. STEP 7 recognizes the following parameter types:

TIMER or COUNTER: this specifies a particular timer or particular counter that will be used when the block is executed. If you supply a value to a formal parameter of the TIMER or COUNTER parameter type, the corresponding actual parameter must be a timer or a counter, in other words, you enter "T" or "C" followed by a positive integer.

BLOCK: specifies a particular block to be used as an input or output. The declaration of the parameter determines the block type to be used (FB, FC, DB etc.). If you supply values to a formal parameter of the BLOCK parameter type, specify a block address as the actual parameter. Example: “FC101" (when using absolute addressing) or “Valve" (with symbolic addressing).

Parameter Capacity Description

TIMER 2. Bytes

Indicates a timer to be used by the program in the called logic block. Format: T1

COUNTER 2 bytes Indicates a counter to be used by the program in the called logic block. Format: C10

BLOCK_FB BLOCK_FC BLOCK_DB BLOCK_SDB

2 bytes Indicates a block to be used by the program in the called logic block. Format: FC101 DB42

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PROGRAMMING IN STATEMENT LIST

What is Statement List?

Statement List (STL) is a textual programming language that can be used to create the code section of logic blocks. Its syntax for statements is similar to assembler language and consists of instructions followed by addresses on which the instructions act.

The Programming Language STL

Of all the programming languages with which you can program S7 controllers, STL is the closest to the machine code MC7 of the S7 CPU. This means that by using it to program S7 controllers, you can optimize the run time and the use of memory.

The programming language STL has all the necessary elements for creating a complete user program. It contains a comprehensive range of instructions. A total of over 130 different basic instructions and a wide range of addresses are available. Functions and function blocks allow you to structure your STL program clearly.

The Programming Package

The STL programming package is an integral part of the STEP 7 Standard Software. This means that following the installation of your STEP 7 software, all the editor functions, compiler functions and test/debug functions for STL are available to you.Using STL, you can create your own user program as follows:_ With the Incremental Editor. The input of the local data structure is made easier with the help of table editors._ With a source file in the Text Editor. Text input is made easier with the help of block templates.

There are three programming languages in the standard software, STL, FBD, and LAD. You can switch from one language to the other almost without restriction and choose the most suitable language for the particular block you are programming.If you write programs in LAD or FBD, you can always switch over to the STL representation. If you convert LAD programs into FBD programs and vice versa, program elements that cannot be represented in the destination language are displayed in STL.

A STATEMENT CONSISTS OF AN INSTRUCTION AND AN ADDRESS

Address of an Instruction

The address of an instruction indicates a constant or the location where the instruction finds a value (data object) on which to perform an operation. The address can have a symbolic name or an absolute designation. The address can point to any of the following items :_ A constant, the value of a timer or counter, or an ASCII character string to be loaded into accumulator 1 (for example, L +27 See Table 2.1)_ A bit in the status word of the programmable logic controller _ A symbolic name (for example, A Motor.On, see Table 2-3)_ A data block and a location within the data block area (for example, L DB4.DBD10, see Table 2-4)_ A function (FC), function block (FB), integrated system function (SFC), or integrated system function block (SFB) and the number of the function or block (see Table 2-5)_ An address identifier and a location within the memory area that is indicated by the address identifier (for example, A I 1.0)

PAGE 15

COMMANDS USED IN STATEMENT LIST

Bit Logic Instructions ) Nesting Closed= AssignA AndA( And with Nesting OpenAN And NotAN( And Not with Nesting OpenFN Edge NegativeFP Edge PositiveO OrO And before OrO( Or with Nesting OpenON Or NotON( Or Not with Nesting OpenR ResetS Set

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Comparison Instructions

PAGE 26

`

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Conversion Instructions

PAGE 28

BTD BCD to Double Integer (32-Bit)Example:L MD10 Load the BCD number into ACCU 1.BTD Convert from BCD to integer; store result in ACCU 1.T MD20 Transfer result (double integer number) to MD20.

BTI BCD to Integer (16-Bit)Example:L MW10 Load the BCD number into ACCU 1-L.BTI Convert from BCD to integer; store result in ACCU 1-L.T MW20 Transfer result (integer number) to MW20.

CAD Change Byte Sequence in ACCU 1 (32-Bit)Example:L MD10 Load the value of MD10 into ACCU 1.CAD Reverse the sequence of bytes in ACCU 1.T MD20 Transfer the results to MD20.

Contents of ACCU 1 before execution of CAD:ACCU 1-H-H: ACCU 1-H-L: ACCU 1-L-H: ACCU 1-L-L:value "A" value "B" value "C" value "D"

Contents of ACCU 1 after execution of CAD:ACCU 1-H-H: ACCU 1-H-L: ACCU 1-L-H: ACCU 1-L-L:value "D" value "C" value "B" value "A"

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CAW Change Byte Sequence in ACCU 1-L (16-Bit)Example:L MW10 Load the value of MW10 into ACCU 1.CAW Reverse the sequence of bytes in ACCU 1-L.T MW20 Transfer the result to MW20.

Contents of ACCU 1 before execution of CAW:

ACCU 1-H-H: ACCU 1-H-L: ACCU 1-L-H: ACCU 1-L-L:value "A" value "B" value "C" value "D"

Contents of ACCU 1 after execution of CAW:ACCU 1-H-H: ACCU 1-H-L: ACCU 1-L-H: ACCU 1-L-L:value "A" value "B" value "D" value "C"

DTB Double Integer (32-Bit) to BCDExample:L MD10 Load the 32-bit integer into ACCU 1.DTB Convert from integer (32-bit) to BCD, store result in ACCU 1.T MD20 Transfer result (BCD number) to MD20.

DTR Double Integer (32-Bit) to Floating-Point Number (32-Bit, IEEE-FP)Example:L MD10 Load the 32-bit integer into ACCU 1.

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DTR Convert from double integer to floating point (32-bit IEEE FP); store result in ACCU 1.

T MD20 Transfer result (BCD number) to MD20.

INVD Ones Complement Double Integer (32-Bit)Example:Bit 31 16 15 0

Contents of ACCU 1before execution of INVD 0110 1111 1000 1100 0110 0011 1010 1110

Contents of ACCU 1after execution of INVD 1001 0000 0111 0011 1001 1100 0101 0001

L ID8 Load value into ACCU 1.INVD Form ones complement (32-bit).T MD10 Transfer result to MD10.

INVI Ones Complement Integer (16-Bit)Example:Bit 15 0 Contents of ACCU 1-L before execution of INVI 0110 0011 1010 1110Contents of ACCU 1-L after execution of INVI 1001 1100 0101 0001

L IW8 Load value into ACCU 1-L.INVI Form ones complement 16-bit.T MW10 Transfer result to MW10.

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ITB Integer (16-Bit) to BCDExample:L MW10 Load the integer number into ACCU 1-L.ITB Convert from integer to BCD (16-bit); store result in ACCU 1-L.T MW20 Transfer result (BCD number) to MW20.

ITD Integer (16-Bit) to Double Integer (32-Bit)Example:L MW12 Load the integer number into ACCU 1.ITD Convert from integer (16-bit) to double integer (32-bit); store result in ACCU 1.T MD20 Transfer result (double integer) to MD20.

MW12 = "-10" (Integer, 16-bit):

ACCU 1-H ACCU 1-LBit: 31 16 : 15 0Contents of ACCU 1 before execution of ITD: XXXX XXXX XXXX XXXX 1111 1111 1111 0110Contents of ACCU 1 after execution of ITD: 1111 1111 1111 1111 1111 1111 1111 0110(X = 0 or 1, bits are not used for conversion)

NEGD Twos Complement Double Integer (32-Bit) Example:

ACCU 1-H ACCU 1-L

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Bit: 31 .0Contents of ACCU 1 before execution of NEGD: 0101 1111 0110 0100 0101 1101 0011 1000Contents of ACCU 1 after execution of NEGD: 1010 0000 1001 1011 1010 0010 1100 1000L ID8 Load value into ACCU 1.NEGD Generate twos complement (32-bit).T MD10 Transfer result to MD10.

NEGI Twos Complement Integer (16-Bit)Example:Bit 15 0 Contents of ACCU 1-L before execution of NEGI 0101 1101 0011 1000Contents of ACCU 1-L after execution of NEGI 1010 0010 1100 1000

L IW8 Load value into ACCU 1-L.NEGI Form twos complement 16-bit.T MW10 Transfer result to MW10.

NEGR Negate Floating-Point Number (32-Bit, IEEE-FP)Example:L ID8 Load value into ACCU 1 (example: ID 8 = 1.5E+02). NEGR Negate floating-point number (32-bit, IEEE-FP); stores the result in ACCU 1.T MD10 Transfer result to MD10 (example: result = -1.5E+02).

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RND RoundExample:L MD10 Load the floating-point number into ACCU 1-L.RND Convert the floating-point number (32-bit, IEEE-FP) into an integer (32-bit) and

round off the result.T MD20 Transfer result (double integer number) to MD20.Value before conversion: Value after conversion:MD10 = "100.5" => RND => MD20 = "+100"MD10 = "-100.5" => RND => MD20 = "-100"

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RND+ Round to Upper Double IntegerExample:L MD10 Load the floating-point number (32-bit, IEEE-FP) into ACCU 1-L.RND+ Convert the floating-point number (32-bit, IEEE-FP) to an integer (32-bit) and round

result.Store output in ACCU 1.T MD20 Transfer result (double integer number) to MD20.Value before conversion: Value after conversion:MD10 = "100.5" => RND+ => MD20 = "+101"MD10 = "-100.5" => RND+ => MD20 = "-100"

RND- Round to Lower Double IntegerExample:L MD10 Load the floating-point number into ACCU 1-L.RND- Convert the floating-point number (32-bit, IEEE-FP) to an integer (32-bit) and round

result.Store result in ACCU 1.T MD20 Transfer result (double integer number) to MD20.Value before conversion: Value after conversion:MD10 = "100.5" => RND- => MD20 = "+100"MD10 = "-100.5" => RND- => MD20 = "-101"

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TRUNC TruncateExample:L MD10 Load the floating-point number into ACCU 1-L.TRUNC Convert the floating-point number (32-bit, IEEE-FP) to an integer (32-bit) and round

result.Store the result in ACCU 1.T MD20 Transfer result (double integer number) to MD20.Value before conversion: Value after conversion:MD10 = "100.5" => TRUNC => MD20 = "+100"MD10 = "-100.5" => TRUNC => MD20 = "-100"

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Counter Instructions

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CD Counter DownExample:L C#14 Counter preset value.A I 0.1 Preset counter after detection of rising edge of I 0.1.S C1 Load counter 1 preset if enabled.A I 0.0 One count down per rising edge of I 0.0.CD C1 Decrement counter C1 by 1 when RL0 transitions from 0 to 1 depending on input

I 0.0.AN C1 Zero detection using the C1 bit.= Q 0.0 Q 0.0 = 1 if counter 1 value is zero.

CU Counter UpExample:A I 2.1 If there is a positive edge change at input I 2.1.CU C3 Counter C3 is incremented by 1 when RL0 transitions from 0 to 1.

L Load Current Counter Value into ACCU 1Example:L C3 Load ACCU 1-L with the count value of counter C3 in binary format.

LC Load Current Counter Value into ACCU 1 as BCDExample:LC C3 Load ACCU 1-L with the count value of counter C3 in binary coded decimal format.

R Reset CounterExample:A I 2.3 Check signal state at input I 2.3.R C3 Reset counter C3 to a value of 0 if RLO transitions from 0 to 1.

S Set Counter Preset ValueExample:A I 2.3 Check signal state at input I 2.3.L C#3 Load count value 3 into ACCU 1-L.S C1 Set counter C1 to count value if RLO transitions from 0 to 1

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Data Block Instructions

Format: OPN <data block>Example:

OPN DB10 Open data block DB10 as a shared data block.L DBW35 Load data word 35 of the opened data block into ACCU 1-L.T MW22 Transfer the content of ACCU 1-L into MW22.OPN DI20 Open data block DB20 as an instance data block.L DIB12 Load data byte 12 of the opened instance data block into ACCU 1-L.T DBB37 Transfer the content of ACCU 1-L to data byte 37 of the opened shared data

block. Logic Control Instructions JC Jump if RLO = 1Example:

A I 1.0A I 1.2JC JOVR Jump if RLO=1 to jump label JOVR.L IW8 Program scan continues here if jump is not executed.T MW22

JOVR: A I 2.1 Program scan resumes here after jump to jump label JOVR.

JCB Jump if RLO = 1 with BRExample:

A I 1.0A I 1.2JCB JOVR Jump if RLO = 1 to jump label JOVR. Copy the contents of the RLO bit

into the BR bit.L IW8 Program scan continues here if jump is not executed.T MW22


JCN Jump if RLO = 0Example:

A I 1.0A I 1.2JCN JOVR Jump if RLO = 0 to jump label JOVR.L IW8 Program scan continues here if jump is not executed.T MW22


JM Jump if MinusExample:

L IW8L MW12-I //Subtract contents of MW12 from contents of IW8.JM NEG //Jump if result < 0 (that is, contents of ACCU 1 < 0).AN M 4.0 //Program scan continues here if jump is not executed.S M 4.0JU NEXT

NEG: AN M 4.1 //Program scan resumes here after jump to jump label NEG.

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S M 4.1NEXT: NOP 0 //Program scan resumes here after jump to jump label NEXT.

JMZ Jump if Minus or ZeroExample:L IW8L MW12-I Subtract contents of MW12 from contents of IW8.JMZ RGE0 Jump if result <=0 (that is, contents of ACCU 1 <= 0).AN M 4.0 Program scan continues here if jump is not executed.S M 4.0JU NEXTRGE0: AN M 4.1 Program scan resumes here after jump to jump label RGE0.S M 4.1NEXT: NOP 0 Program scan resumes here after jump to jump label NEXT.

JN Jump if Not ZeroExample:

L IW8L MW12XOWJN NOZE Jump if the contents of ACCU 1-L are not equal to zero.AN M 4.0 Program scan continues here if jump is not executed.S M 4.0JU NEXT

NOZE: AN M 4.1 Program scan resumes here after jump to jump label NOZE.S M 4.1

NEXT: NOP 0 Program scan resumes here after jump to jump label NEXT.

JP Jump if PlusExample:

L IW8L MW12-I Subtract contents of MW12 from contents of IW8.JP POS Jump if result >0 (that is, ACCU 1 > 0).AN M 4.0 Program scan continues here if jump is not executed.S M 4.0JU NEXT

POS: AN M 4.1 Program scan resumes here after jump to jump label POS.S M 4.1


JPZ Jump if Plus or ZeroExample:

L IW8L MW12-I Subtract contents of MW12 from contents of IW8.JPZ REG0 Jump if result >=0 (that is, contents of ACCU 1 >= 0).AN M 4.0 Program scan continues here if jump is not executed.S M 4.0JU NEXT

REG0: AN M 4.1 Program scan resumes here after jump to jump label REG0.S M 4.1


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JU Jump UnconditionalExample:

A I 1.0A I 1.2JC DELE Jump if RLO=1 to jump label DELE.L MB10 INC 1T MB10JU FORW Jump unconditionally to jump label FORW.

DELE: L 0T MB10

FORW: A I 2.1 Program scan resumes here after jump to jump label FORW.

JUO Jump if UnorderedExample:

L MD10L ID2/D Divide contents of MD10 by contents of ID2.JUO ERRO Jump if division by zero (that is, ID2 = 0).T MD14 Program scan continues here if jump is not executed.A M 4.0R M 4.0JU NEXT

ERRO: AN M 4.0 Program scan resumes here after jump to jump label ERRO.S M 4.0


JZ Jump if ZeroExample:

L MW10SRW 1JZ ZERO Jump to jump label ZERO if bit that has been shifted out = 0.L MW2 Program scan continues here if jump is not executed.INC 1T MW2JU NEXT

ZERO: L MW4 Program scan resumes here after jump to jump label ZERO.INC 1T MW4


LOOP LoopExample for calculating the factor of 5:

L L#1 Load the integer constant (32 bit) into ACCU 1.T MD20 Transfer the contents from ACCU 1 into MD20 (initialization).L 5 Load number of loop cycles into ACCU 1-L.

NEXT: T MW10 Jump label = loop start / transfer ACCU 1-L to loop counter.L MD20* D Multiply current contents of MD20 by the current contents of MB10.T MD20 Transfer the multiplication result to MD20.L MW10 Load contents of loop counter into ACCU 1.

LOOP NEXT Decr. the contents of ACCU 1 and jump to the NEXT jump label if ACCU 1-L > 0.L MW24 Program scan resumes here after loop is finished.L 200>I

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Load and Transfer Instructions L LoadL <address> loads the addressed byte, word, or double word into ACCU 1 after the old contents of ACCU 1 have been saved into ACCU 2, and ACCU 1 is reset to "0".

Example:L IB10 Load input byte IB10 into ACCU 1-L-L.L MB120 Load memory byte MB120 into ACCU 1-L-L.L DBB12 Load data byte DBB12 into ACCU 1-L-L.L DIW15 Load instance data word DIW15 into ACCU 1-L.L LD252 Load local data double word LD252 ACCU 1.

T TransferT <address> transfers (copies) the contents of ACCU 1 to the destination address if the Master Control Relay is switched on (MCR = 1). If MCR = 0, then the destination address is written with 0. The number of bytes copied from ACCU 1 depends on the size expressed in the destination address. ACCU 1 also saves the data after the transfer procedure. A transfer to the direct I/O area (memory type PQ) also transfers the contents of ACCU 1 or "0" (if MCR=0) to the corresponding address of the process image output table (memory type Q). The instruction is executed without regard to, and without affecting, the status bits.

Example:T QB10 Transfers contents of ACCU 1-L-L to output byte QB10.T MW14 Transfers contents of ACCU 1-L to memory word MW14.T DBD2 Transfers contents of ACCU 1 to data double word DBD2.

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Floating-Point Math Instructions; Basic *R Multiply ACCU 1 and ACCU 2 as Floating Point Numbers (32-Bit IEEE-FP)Example:OPN DB10L ID10 Load the value of ID10 into ACCU 1.L MD14 Load the value of ACCU 1 into ACCU 2.Load the value of MD14 into ACCU 1.*R Multiply ACCU 2 and ACCU 1; store the result in ACCU 1.T DBD25 The content of ACCU 1 (result) is transferred to DBD25 in DB10.

+R Add ACCU 1 and ACCU 2 as a Floating Point Number (32-Bit IEEE-FP)Example:OPN DB10L ID10 Load the value of ID10 into ACCU 1.L MD14 Load the value of ACCU 1 into ACCU 2.Load the value of MD14 into ACCU 1.+R Add ACCU 2 and ACCU 1; store the result in ACCU 1.T DBD25 The content of ACCU 1 (result) is transferred to DBD25 in DB10.

-R Subtract ACCU 1 from ACCU 2 as a Floating Point Number (32-Bit IEEE-FP)Example:

OPN DB10L ID10 Load the value of ID10 into ACCU 1.L MD14 Load the value of ACCU 1 into ACCU 2.Load the value of MD14 into ACCU 1.-R Subtract ACCU 1 from ACCU 2; store the result in ACCU 1.T DBD25 The content of ACCU 1 (result) is transferred to DBD25 in DB10.

/R Divide ACCU 2 by ACCU 1 as a Floating Point Number (32-Bit IEEE-FP)Example:OPN DB10L ID10 Load the value of ID10 into ACCU 1.L MD14 Load the contents of ACCU 1 into ACCU 2.Load the value of MD14 into

ACCU 1./R Divide ACCU 2 by ACCU 1; store the result in ACCU 1.T DBD20 The content of ACCU 1 (result) is transferred to DBD20 in DB10.

ABS Absolute Value of a Floating Point Number (32-Bit IEEE-FP)Example:L ID8 Load value into ACCU 1 (example: ID8 = -1.5E+02).ABS Form the absolute value; store the result in ACCU 1.T MD10 Transfer result to MD10 (example: result = 1.5E+02).

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Floating-Point Math Instructions: Extended

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Integer Math Instructions + Add Integer Constant (16, 32 Bit)+ <integer constant> adds the integer constant to the contents of ACCU 1 and stores the result in ACCU 1. The instruction is executed without regard to, and without affecting, the status word bits.The contents of accumulator 2 remain unchanged for CPUs with two ACCUs.The contents of accumulator 3 are copied into accumulator 2, and the contents of accumulator 4 are copied into accumulator 3 for CPUs with four ACCUs. The contents of accumulator 4 remain unchanged.

+ <16-bit integer constant>: Adds a 16-bit integer constant (in the range of -32768 to +32767) to the contents of ACCU 1-L and stores the result in ACCU 1-L.The contents of accumulator 2 remain unchanged for CPUs with two ACCUs.The contents of accumulator 3 are copied into accumulator 2, and the contents of accumulator 4 are copied into accumulator 3 for CPUs with four ACCUs. The contents of accumulator 4 remain unchanged.+ <32-bit integer constant>: Adds a 32-bit integer constant (in the range of -2,147,483,648 to 2,147,483,647) to the contents of ACCU 1 and stores the result in ACCU 1.

The contents of accumulator 2 remain unchanged for CPUs with two ACCUs.The contents of accumulator 3 are copied into accumulator 2, and the contents of accumulator 4 are copied into accumulator 3 for CPUs with four ACCUs. The contents of accumulator 4 remain unchanged.

Example 1:L IW10 Load the value of IW10 into ACCU 1-L.L MW14 Load the contents of ACCU 1-L to ACCU 2-L. Load the value of MW14 into

ACCU 1-L.+I Add ACCU 2-L and ACCU 1-L; store the result in ACCU 1-L.+ 25 Add ACCU 1-L and 25; store the result in ACCU 1-L.T DB1.DBW25 Transfer the contents of ACCU 1-L (result) to DBW25 of DB1.

Example 2:L IW12L IW14+ 100 Add ACCU 1-L and 100; store the result in ACCU 1-L.>I If ACCU 2 > ACCU 1, or IW12 > (IW14 + 100)JC NEXT then conditional jump to jump label NEXT.

Example 3:L MD20L MD24+D Add ACCU 1and ACCU 2; store the result in ACCU 1.+ L#-200 Add ACCU 1 and -200; store the result in ACCU 1.T MD28

+D Add ACCU 1 and ACCU 2 as Double Integer (32-Bit)Example:L ID10 Load the value of ID10 into ACCU 1.L MD14 Load the contents of ACCU 1 to ACCU 2.Load the value of MD14 into ACCU 1.+D Add ACCU 2 and ACCU 1; store the result in ACCU 1.T DB1.DBD25 The contents of ACCU 1 (result) are transferred to DBD25 of DB1.

-D Subtract ACCU 1 from ACCU 2 as Double Integer (32-Bit)Example:L ID10 Load the value of ID10 into ACCU 1.

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L MD14 Load the contents of ACCU 1 into ACCU 2.Load the value of MD14 into ACCU 1.-D Subtract ACCU 1 from ACCU 2; store the result in ACCU 1.T DB1.DBD25 The contents of ACCU 1 (result) are transferred to DBD25 of DB1.

*D Multiply ACCU 1 and ACCU 2 as Double Integer (32-Bit)Example:L ID10 Load the value of ID10 into ACCU 1.L MD14 Load contents of ACCU 1 into ACCU 2.Load contents of MD14 into ACCU 1.*D Multiply ACCU 2 and ACCU 1; store the result in ACCU 1.T DB1.DBD25 The contents of ACCU 1 (result) are transferred to DBD25 in DB1.

/D Divide ACCU 2 by ACCU 1 as Double Integer (32-Bit)Example:L ID10 Load the value of ID10 into ACCU 1.L MD14 Load the contents of ACCU 1 into ACCU 2.Load the value of MD14 into ACCU 1./D Divide ACCU 2 by ACCU 1; store the result (quotient) in ACCU 1. T MD20 The contents of ACCU 1 (result) are transferred to MD20.

Example above: 13 divided by 4Contents of ACCU 2 before instruction (ID10): "13"Contents of ACCU 1 before instruction (MD14): "4"Instruction /D (ACCU 2 / ACCU 1) : "13/4" Contents of ACCU 1 after instruction (quotient): "3"

+I Add ACCU 1 and ACCU 2 as Integer (16-Bit)Example:L IW10 Load the value of IW10 into ACCU 1-L.L MW14 Load the contents of ACCU 1-L into ACCU 2-L.Load the value of MW14 into

ACCU 1-L.+I Add ACCU 2-L and ACCU 1-L; store the result in ACCU 1-L.T DB1.DBW25 The contents of ACCU 1-L (result) are transferred to DBW25 of DB1.

-I Subtract ACCU 1 from ACCU 2 as Integer (16-Bit)Example:L IW10 Load the value of IW10 into ACCU 1-L.L MW14 Load the contents of ACCU 1-L into ACCU 2-L.Load the value of MW14 into

ACCU 1-L.-I Subtract ACCU 1-L from ACCU 2-L; store the result in ACCU 1-L.T DB1.DBW25 The contents of ACCU 1-L (result) are transferred to DBW25 of DB1.

*I Multiply ACCU 1 and ACCU 2 as Integer (16-Bit)Example:L IW10 Load the value of IW10 into ACCU 1-L.L MW14 Load contents of ACCU 1-L into ACCU 2-L.Load contents of MW14 into ACCU 1-

L.*I Multiply ACCU 2-L and ACCU 1-L, store result in ACCU 1.T DB1.DBD25 The contents of ACCU 1 (result) are transferred to DBW25 in DB1.

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/I Divide ACCU 2 by ACCU 1 as Integer (16-Bit)Example:

L IW10 Load the value of IW10 into ACCU 1-L.L MW14 Load the contents of ACCU 1-L into ACCU 2-L.Load the value of MW14 into

ACCU 1-L./I Divide ACCU 2-L by ACCU 1-L; store the result in ACCU 1:ACCU 1-L: quotient,

ACCU 1-H: remainderT MD20 The contents of ACCU 1 (result) are transferred to MD20.Example above: 13 divided by 4Contents of ACCU 2-L before instruction (IW10): "13"Contents of ACCU 1-L before instruction (MW14): "4"Instruction /I (ACCU 2-L / ACCU 1-L): "13/4" Contents of ACCU 1-L after instruction (quotient): "3"Contents of ACCU 1-H after instruction (remainder): "1"

MOD Division Remainder Double Integer (32-Bit)Example:L ID10 Load the value of ID10 into ACCU 1.L MD14 Load the contents of ACCU 1 into ACCU 2.Load the value of MD14 into ACCU 1.MOD Divide ACCU 2 by ACCU 1, store the result (remainder) in ACCU 1.T MD20 The contents of ACCU 1 (result) are transferred to MD20.Example above : 13 divided by 4Contents of ACCU 2 before instruction (ID10): "13"Contents of ACCU 1 before instruction (MD14): "4"Instruction MOD (ACCU 2 / ACCU 1): "13/4" Contents of ACCU 1 after instruction (remainder): "3"

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Program Control Instructions BE Block EndBE (block end) terminates the program scan in the current block and causes a jump to the block that called the current block. The program scan resumes with the first instruction that follows the block call statement in the calling program.

BEC Block End ConditionalIf RLO = 1, then BEC (block end conditional) interrupts the program scan in the current block and causes a jump to the block that called the current block.

Example:A I 1.0 Update RLO.BEC End block if RLO = 1.L IW4 Continue here if BEC is not executed, RLO = 0.T MW10

BEU Block End UnconditionalBEU (block end unconditional) terminates the program scan in the current block and causes a jump to the block that called the current block. The program scan resumes with the first instruction that follows the block call.Example:A I 1.0JC NEXT Jump to NEXT jump label if RLO = 1 (I 1.0 = 1).L IW4 Continue here if no jump is executed.T IW10A I 6.0A I 6.1S M 12.0BEU Block end unconditional.NEXT: NOP 0 Continue here if jump is executed.

CALL Block CallCALL <logic block identifier> is used to call functions (FCs) or function blocks (FBs), system functions (SFCs) or system function blocks (SFBs) you created yourself or to call the standard pre-programmed blocks shipped by Siemens. The CALL instruction calls the FC and SFC or the FB and SFB that you input as an address, independent of the RLO or any other condition.

Example: CALL FB1, DB1 or CALL FILLVAT1, RECIPE1

Logic Block Block Type Absolute Address Call SyntaxFC Function CALL FCnSFC System function CALL SFCnFB Function block CALL FBn1,DBn2 SFB System function block CALL SFBn1,DBn2

Example 1: Assigning parameters to the FC6 callCALL FC6Formal parameter Actual parameterNO OF TOOL := MW100TIME OUT := MW110FOUND:= Q 0.1ERROR := Q 100.0

Example 2: Calling an SFC without parametersCALL SFC43 Call SFC43 to re-trigger watchdog timer (no parameters).

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Example 3: Calling FB99 with instance data block DB1CALL FB99,DB1Formal parameter Actual parameterMAX_RPM := #RPM1_MAXMIN_RPM := #RPM2MAX_POWER := #POWERMAX_TEMP := #TEMP

Example 4: Calling FB99 with instance data block DB2CALL FB99,DB2Formal parameter Actual parameterMAX_RPM := #RPM3_MAXMIN_RPM := #RPM2MAX_POWER := #POWER1MAX_TEMP := #TEMP

CC Conditional CallCC <logic block identifier> (conditional block call) calls a logic block if RLO=1. CC is used to call logic blocks of the FC or SFC type without parameters.Example:A I 2.0 Check signal state at input I 2.0.CC FC6 Call function FC6 if I 2.0 is "1".A M 3.0 Executed upon return from called function (I 2.0 = 1) or directly after A I 2.0

statement if I 2.0 = 0.

UC Unconditional Call UC <logic block identifier> (unconditional block call) calls a logic block of the FC or SFC type. UC is like the CALL instruction, except that you cannot transfer parameters with the called block.

Example 1:UC FC6 Call function FC6 (without parameters).

Example 2:UC SFC43 Call system function SFC43 (without parameters).

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Shift Instructions

SLD Shift Left Double Word (32-Bit)SLD <number>: The number of shifts is specified by the address <number>. The permissible value range is from 0 to 32. The status word bits CC 0 and OV are reset to zero if <number> is greater than zero. If <number> is equal to zero, then the shift instruction is regarded as a NOP operation.Examples:

ACCU 1-H ACCU 1-L Bit: 31 16 15 0ACCU 1 before execution of SLD 5: 0101 1111 0110 0100 0101 1101 0011 1011ACCU 1 after execution of SLD 5: 1110 1100 1000 1011 1010 0111 0110 0000Example 1:L MD4 Load value into ACCU 1.SLD 5 Shift bits in ACCU 1 five places to the left.T MD8 Transfer result to MD8.

SLW Shift Left Word (16-Bit)SLW <number>: The number of shifts is specified by the address <number>. The permissible value range is from 0 to 15. The status word bits CC 0 and OV are reset to zero if <number> is greater than zero. If <number> is equal to zero, then the shift instruction is regarded as a NOP operation.

Examples:ACCU 1-H ACCU 1-L

Bit: 31 16 15 0ACCU 1 before execution of SLW 5: 0101 1111 0110 0100 0101 1101 0011 1011ACCU 1 after execution of SLW 5: 0101 1111 0110 0100 1010 0111 0110 0000

Example 1:L MW4 Load value into ACCU 1.SLW 5 Shift the bits in ACCU 1 five places to the left.T MW8 Transfer result to MW8.

SRD Shift Right Double Word (32-Bit)SRD <number>: The number of shifts is specified by the address <number>. The permissible value range is from 0 to 32. The status word bits CC 0 and OV are reset to 0 if <number> is greater thnan zero.Examples:ACCU 1-H ACCU 1-L

Bit: 31 16 15 0ACCU 1 before execution of SRD 7:0101 1111 0110 0100 0101 1101 0011 1011ACCU 1 after execution of SRD 7: 0000 0000 1011 1110 1100 1000 1011 1010

Example 1:L MD4 Load value into ACCU 1.SRD 7 Shift bits in ACCU 1 seven places to the right.T MD8 Transfer result to MD8.

SRW Shift Right Word (16-Bit)SRW <number>: The number of shifts is specified by the address <number>. The permissible value range is from 0 to 15. The status word bits CC 0 and OV are reset to 0 if <number> is greater than zero.Examples:ACCU 1-H ACCU 1-LBit: 31 16 15 0ACCU 1 before execution of SRW 6: 0101 1111 0110 0100 0101 1101

0011 1011

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ACCU 1 after execution of SRW 6: 0101 1111 0110 0100 0000 0001 01110100

Example 1:L MW4 Load value into ACCU 1.SRW 6 Shift bits in ACCU 1-L six places to the right.T MW8 Transfer result to MW8.

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Timer Instructions

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SD On-Delay TimerSD <timer> starts the addressed timer when the RLO transitions from "0" to "1". The programmed time interval elapses as long as RLO = 1. The time is stopped if RLO transitions to "0" before the programmed time interval has expired. This timer start instruction expects the time value and the time base to be stored as a BCD number in ACCU 1-L.

Example:A I 2.1L S5T#10s Preset 10 seconds into ACCU 1.SD T1 Start timer T1 as an on-delay timer.

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SE Extended Pulse TimerSE <timer> starts the addressed timer when the RLO transitions from "0" to "1". The programmed time interval elapses, even if the RLO transitions to "0" in the meantime. The programmed time interval is started again if RLO transitions from "0" to "1" before the programmed time has expired. This timer start command expects the time value and the time base to be stored as a BCD number in ACCU 1-L.Example:A I 2.1L S5T#10s Preset 10 seconds into ACCU 1.SE T1 Start timer T1 as an extended pulse timer.A I 2.2R T1 Reset timer T1.A T1 Check signal state of timer T1.= Q 4.0

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SF Off-Delay TimerSF <timer> starts the addressed timer when the RLO transitions from "1" to "0". The programmed time elapses as long as RLO = 0. The time is stopped if RLO transitions to "1" before the programmed time interval has expired. This timer start command expects the time value and the time base to be stored as a BCD number in ACCU 1-L.Example:A I 2.1L S5T#10s Preset 10 seconds into ACCU 1.SF T1 Start timer T1 as an off-delay timer.A I 2.2R T1 Reset timer T1.A T1 Check signal state of timer T1.= Q 4.0

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SP Pulse TimerSP <timer> starts the addressed timer when the RLO transitions from "0" to "1". The programmed time elapses as long as RLO = 1. The timer is stopped if RLO transitions to "0" before the programmed time interval has expired. This timer start command expects the time value and the time base to be stored as a BCD number in ACCU 1-L.Example:A I 2.1L S5T#10s Preset 10 seconds into ACCU 1.SP T1 Start timer T1 as a pulse timer.A I 2.2R T1 Reset timer T1.A T1 Check signal state of timer T1.= Q 4.0

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SS Retentive On-Delay TimerSS <timer> (start timer as a retentive ON timer) starts the addressed timer when the RLO transitions from "0" to "1". The full programmed time interval elapses, even if the RLO transitions to "0" in the meantime. The programmed time interval is re-triggered (started again) if RLO transitions from "0" to "1" before the programmed time has expired. This timer start command expects the time value and the time base to be stored as a BCD number in ACCU 1-L.Example:A I 2.1L S5T#10s Preset 10 seconds into ACCU 1.SS T1 Start timer T1 as a retentive on-delay timer.A I 2.2R T1 Reset timer T1.A T1 Check signal state of timer T1.= Q 4.0

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R Reset TimerR <timer> stops the current timing function and clears the timer value and the time base of the addressed timer word if the RLO transitions from 0 to 1.Example:A I 2.1R T1 Check the signal state of input I 2.1 If RLO transitioned from 0 = 1, then reset timer

T1.

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Word Logic Instructions AD AND Double Word (32-Bit)AD (AND double word) combines the contents of ACCU 1 with ACCU 2 or a 32-bit constant bit by bit according to the Boolean logic operation AND. A bit in the result double word is "1" only when the corresponding bits of both double words combined in the logic operation are "1".

Examples:Bit: 31 Bit:0

ACCU 1 before execution of AD: 0101 0000 1111 1100 1000 1001 0011 1011ACCU 2 or 32-bit constant: 1111 0011 1000 0101 0111 0110 1011 0101Result (ACCU 1) after execution of AD:0101 0000 1000 0100 0000 0000 0011 0001

L ID20 Load contents of ID20 into ACCU 1.L ID24 Load contents of ACCU 1 into ACCU 2.Load contents of ID24 into ACCU 1.AD Combine bits from ACCU 1 with ACCU 2 by AND, store result in ACCU 1. T MD8 Transfer result to MD8.

AW AND Word (16-Bit)AW (AND word) combines the contents of ACCU 1-L with ACCU 2-L or a 16 bit-constant bit by bit according to the Boolean logic operation AND. A bit in the result word is "1" only when the corresponding bits of both words combined in the logic operation are "1".Examples:

Bit: 15 Bit:0ACCU 1-L before execution of AW: 0101 1001 0011 1011ACCU 2-L or 16-bit constant: 1111 0110 1011 0101Result (ACCU 1-L) after execution of AW: 0101 0000 0011 0001

L IW20 Load contents of IW20 into ACCU 1-L.L IW22 Load contents of ACCU 1 into ACCU 2.Load contents of IW22 into ACCU 1-L.AW Combine bits from ACCU 1-L with ACCU 2-L bits by AND; store result in ACCU 1-L.T MW 8 Transfer result to MW8.

OD OR Double Word (32-Bit)OD (OR double word) combines the contents of ACCU 1 with ACCU 2 or a 32-bit constant bit by bit according to the Boolean logic operation OR. A bit in the result double word is "1" when at least one of the corresponding bits of both double words combined in the logic operation is "1".

Examples:

Bit: 31 Bit:0ACCU 1 before execution of OD: 0101 0000 1111 1100 1000 0101 0011 1011ACCU 2 or 32-bit constant: 1111 0011 1000 0101 0111 0110 1011 0101Result (ACCU 1) after execution of OD:1111 0011 1111 1101 1111 0111 1011 1111

L ID20 Load contents of ID20 into ACCU 1.L ID24 Load contents of ACCU 1 into ACCU 2.Load contents of ID24 into ACCU 1.OD Combine bits from ACCU 1 with ACCU 2 bits by OR; store result in ACCU 1.T MD8 Transfer result to MD8.

OW OR Word (16-Bit)OW (OR word) combines the contents of ACCU 1-L with ACCU 2-L or a 16 bit-constant bit by bit according to the Boolean logic operation OR. A bit in the result word is "1" when at least one of the corresponding bits of both words combined in the logic operation is "1".Examples:

Bit: 15 Bit:0ACCU 1-L before execution of OW: 0101 0101 0011 1011

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ACCU 2-L or 16 bit constant: 1111 0110 1011 0101Result (ACCU 1-L) after execution of OW: 1111 0111 1011 1111

L IW20 Load contents of IW20 into ACCU 1-L.L IW22 Load contents of ACCU 1 into ACCU 2.Load contents of IW22 into ACCU 1-L.OW Combine bits from ACCU 1-L with ACCU 2-L by OR, store result in ACCU 1-L.T MW8 Transfer result to MW8.

XOD Exclusive OR Double Word (32-Bit)XOD (XOR double word) combines the contents of ACCU 1 with ACCU 2 or a 32-bit constant bit by bit according to the Boolean logic operation XOR (Exclusive Or). A bit in the result double word is "1" when only one of the corresponding bits of both double words combined in the logic operation is "1".Examples:

Bit: 31 Bit:0ACCU 1 before execution of XOD: 0101 0000 1111 1100 1000 0101 0011 1011ACCU 2 or 32-bit constant: 1111 0011 1000 0101 0111 0110 1011 0101Result (ACCU 1) after execution of OD:1010 0011 0111 1001 1111 0011 1000 1110

L ID20 Load contents of ID20 into ACCU 1.L ID24 Load contents of ACCU 1 into ACCU 2.Load contents of ID24 into ACCU 1.XOD Combine bits from ACCU 1 with ACCU 2 by XOR; store result in ACCU 1. T MD8 Transfer result to MD8.

XOW Exclusive OR Word (16-Bit)XOW (XOR word) combines the contents of ACCU 1-L with ACCU 2-L or a 16 bit-constant bit by bit according to the Boolean logic operation XOR. A bit in the result word is "1" only when one of the corresponding bits of both words combined in the logic operation is "1".Examples:

Bit: 15 Bit:0ACCU 1 before execution of XOW: 0101 0101 0011 1011ACCU 2-L or 16-bit constant: 1111 0110 1011 0101Result (ACCU 1) after execution of XOW: 1010 0011 1000 1110

L IW20 Load contents of IW20 into ACCU 1-L.L IW22 Load contents of ACCU 1 into ACCU 2.Load contents of ID24 into ACCU 1-L.XOW Combine bits of ACCU 1-L with ACCU 2-L bits by XOR, store result in ACCU 1-L.T MW8 Transfer result to MW8.

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Accumulator Instructions

DEC Decrement ACCU 1-L-L Example:L MB250 Load the value of MB250DEC 1 Instruction "Decrement ACCU 1-L-L by 1"; store result in ACCU 1-L-L.T MB250 Transfer the contents of ACCU 1-L-L (result) back to MB250.

INC Increment ACCU 1-L-L Example:L MB22 Load the value of MB22INC 1 Instruction "Increment ACCU 1 (MB22) by 1"; store result in ACCU 1-L-LT MB22 Transfer the contents of ACCU 1-L-L (result) back to MB22

TAK Toggle ACCU 1 with ACCU 2Example:Subtract smaller value from greater value:Example:

L MW10 Load contents of MW10 into ACCU 1-L.L MW12 Load contents of ACCU 1-L into ACCU 2-L.Load contents of MW12 into ACCU 1->I Check if ACCU 2-L (MW10) greater than ACCU 1-L (MW12).JC NEXT Jump to NEXT jump label if ACCU 2 (MW10) is greater than ACCU 1

(MW12).TAK Swap contents ACCU 1 and ACCU 2

NEXT: -I Subtract contents of ACCU 2-L from contents of ACCU 1-L.T MW14 Transfer result (= greater value minus smaller value) to MW14.

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PROGRAMMING EXAMPLES

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siemens s7-300

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