s5 to s7 conversion tips v1

8/16/2019 S5 to S7 Conversion Tips V1

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S5 TO S7

CONVERSION

A Com pi lat ion o f Tips , Tr icks &

FAQs

Version - V1.0

Compiled By

MNC Automation Pvt. Ltd.www.mncau tma t ion . com



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1. INDEXContents Page

1. Index 2

2. Introduction 3

3. Binary Commands 4

4. Arithmetic Operations 6

5. Counters 9

6. Timers 10

7. Linking Operations 11

8. String Data 13

9. Conversion of Blocks 14

10. Analog Values 18

11. Bit Byte Indirect Addressing 21

12. PID Control Parameters 23



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2. INTRODUCTION

SIMATIC S5 has been a workhorse for the Industrial Automation for Decades. Even though it was

phased out more than 10 years ago, it is still popular among users.

There are still many SIMATIC-S5 systems running in various industries and are gradually beingconverted to SIMATIC S7. Siemens has provided us with a Manual on S5 to S7 conversion tool,which is installed as a part of the STEP7 Installation. This Manual can be downloaded from thefollowing link :

http://support.automation.siemens.com/WW/view/en/45531547

However there are many more Tips, Tricks and FAQs scattered around the Support Portal which arequite useful for anyone who has to convert a SIMATIC-S5 system to a SIMATIC-S7 system.

This is a compilation of many of these FAQs in one document to serve as a comprehensive guide for the programmers.

This is the First version of the Document intended for free circulation among programmers.

We intend to keep updating the document from time to time. Suggestions and advise for the same iswelcome.

Release Data :

1 Version - V1.0 - Initial Release



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3. BINARY COMMANDS

The table below gives a list of STEP5 commands and the equivalent commands that you must use in

STEP7 when programming an S7-300/400. This table is designed to act as a link to your STEP5 know-how

when creating a STEP7 Program

Operand area in STEP5 Operand area in STEP7

F Flag M Bit memory

I Digital inputs I Digital inputs

Q Digital outputs Q Digital output

D Data bit of a data word

froma data block

DBX An operand on a memory

area that is controlled via

the DB1 tab.

DIX An operand on a memory

area that is controlled via

the DB2 tab.

IN Input parameter

IN_OUT Through parameter

OUT Output parameter

L Temporary variable

Position STEP5 STEP7

OperationPermissible

OperationPermissible

operand operand

Query at "1" Q I,Q,F,D Q I,Q,F,L,DBX,DIX,IN,

IN_OUT

Query at "0" QN I,Q,F,D QNI,Q,F,L,DBX,DIX,IN,

IN_OUT

Change state of signal flow

Q F 1.0 Q F 1.0

Q F 1.1 Q F 1.1

= F 1.2 NOT

QN F 1.2 = F 1.2

I,Q,F,D I,Q,F,L,DBX,DIX,IN,IN_OUT



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Compare two fixed point numbers (16 bit) for "greater than or equal to". If

ACCU 2 is greater than or equal to ACCU 1, RLO=1.

>=F >=I

Compare two fixed point numbers (16 bit) for "less than or equal to". If

ACCU 2 is less than or equal to ACCU 1, RLO=1.

<=F <=I

Compare two floating point numbers (32bit) for "equal to". If ACCU 2 is

equal to ACCU 1, RLO=1.

!=G ==R

Compare two floating point numbers (32 bit) for "not equal to". If ACCU 2

is not equal to ACCU 1, RLO=1.

><G <>R

Compare two floating point numbers (32 bit) for "greater than". If ACCU 2

is greater than ACCU 1, RLO=1.

>G >R

Compare two floating point numbers (32 bit) for "less than". If ACCU 2 is

less than ACCU 1, RLO=1.

<G <R

Compare two floating point numbers (32 bit) for "greater than or equal to".

If ACCU 2 is greater than or equal to ACCU 1, RLO=1.

>=G >=R

Compare two floating point numbers (32 bit) for "less than or equal to". If

ACCU 2 is less than or equal to ACCU 1, RLO=1.

<=G <=R

Compare two fixed point double words (32 bit) for "equal to". If ACCU 2 is

equal to ACCU 1, RLO=1.

!D ==D

Compare two fixed point double words (32 bit) for "not equal to". If ACCU 2

is not equal to ACCU 1, RLO=1.

><D <>D

Compare two fixed point double words (32 bit) for "greater than". If ACCU

2 is greater than ACCU 1, RLO=1.

>D >D

Compare two fixed point double words (32 bit) for "less than". If ACCU 2 is

less than ACCU 1, RLO=1.

<D <D

Compare two fixed point double words (32 bit) for "greater than or equal

to". If ACCU 2 is greater than or equal to ACCU 1, RLO=1.

>=D >=D

Compare two fixed point double words (32 bit) for "less than or equal to". If ACCU 2 is less than or equal to ACCU 1, RLO=1.

<=D <=D

Table 03 - Operations for calling blocks, closing blocks and jumping to jump labels in STEP 5 and the

equivalents in STEP 7. The jump statements in STEP 7 can be cross-network and the distance between

jump source and jump destination can be greater than 128 statements in STEP 7.



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Function description Operations in STL

STEP 5 STEP 7

Absolute block call. SPA <Operand> CALL <Operand>

Conditional block call (RLO=1). U <Operand>SPB <Operand>

U <Operand>SPBNB <jump label>

CALL <Operand>

Absolute block termination. BEA BEA

Conditional block termination

(RLO=1).

BEB BEB

Block termination (completion of a

block)

BE BE

J ump to jump label. SPB =M001

(max. 128 statements in one

network).

SPB M001

(cross-network, no

limits)

Define jump label (max. 4 characters). M001: NOP 0 M001: NOP 0

Table 04 - Arithmetic operations in STEP 5 and the equivalents in STEP 7.

Function description Operations in STL

STEP 5 STEP 7

Add two fixed point numbers (16 Bit): ACCU 2 +ACCU 1 +F +I

Subtract two fixed point numbers (16 Bit): ACCU 2 - ACCU 1 -F -I

Multiply two fixed point numbers (16 Bit): ACCU 2 * ACCU 1 xF *I

Divide two fixed point numbers (16 Bit): ACCU 2 / ACCU 1 :F /I

Add two floating pointnumbers (32Bit): ACCU 2+ACCU 1 +G +R

Subtract two floating pointnumbers (32 Bit): ACCU 2 - ACCU 1 -G -R

Multiply two floating pointnumbers (32 Bit): ACCU 2 *ACCU 1 xG *R

Divide two floating pointnumbers (32Bit): ACCU 2 / ACCU 1 :G /R

Add two fixed point numbers (32 Bit): ACCU 2 +ACCU 1 +D +D

Subtract two fixed point numbers (32 Bit): ACCU 2 - ACCU 1 -D -D

Multiply two fixed pointnumbers (32Bit): ACCU 2 *ACCU 1 xD *D

Divide two fixed point numbers (32 Bit): ACCU 2 / ACCU 1 :D /D



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5. COUNTERS

The following table lists the command sequences for counters under STEP 5 and their equivalents in

STEP7

STEP5 STEP7

Operation Operand Operation Operation

Pure up

counter

A I 2.2 A I 2.2

CU C 6 CU C 6

A I 2.5 A I 2.5

R C 6 R C 6

Up counter,

down counter

and counter

delete

A I2.2 A I2.2

CU C 6 CU C 6

A I 2.3 A I 2.3

CD C 6 CD C 6

A I 2.4 A I 2.4

L KC 4 L C#4S C 6 S C 6

A I 2.5 A I 2.5

R C 6 R C 6

Preset

counter to

value

A I 2.7 A I 2.7

L KC 6 L C#6

S C 6 S C 6

(KC = (C=

1 to 999) 1 to 999 )

Query

counter bit

A C 6 A C 6

(is "1" if counter is

not equal to zero)

(is "1" if counter

is notequal to

zero)

Load current

counter value

L C 6 L C 6



10

(S5: binary, T FW 30 T MW 30

S7: integer)

Load current

counter value

LD C 6 LC C 6

(BCD) T FW32 T MW32

6. TIMERS

The S5TIME data type is stored in binary-coded decimal format (BCD). When you are working with

the S5TIME data type, you define a time value in the range from0 to 999 and a time base.

The time base indicates the interval with which a time decrements the time value by "1" until the timevalue "0" is reached.

Binary structure of the S5TIME data type

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

X X b b a3 a3 a3 a3 a2 a2 a2 a2 a1 a1 a1 a1

X =Irrelevant: these bits are ignoredwhen the time is started.

B =Time base (see table below)

a1-a3 =Time value in the binary-coded decimal format (BCD)

Time base for data of the S5TIME data type

Time base Binary code Possible range

10 ms 00 10 ms - 9 s 990 ms100 ms 01 100 ms - 1 min 39 s 990 ms

1 s 10 1 s - 16 min 39 s

10 s 11 10 s - 2 hr 46 min 30 s



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7. LINKING OPERATIONS

The following table lists the operands in STEP 5 and their STEP 7 equivalents.

Operand area in STEP5 Operand area in STEP7

FW Flag word word MW Bit memory word

IW Input word IW Input word

QW Output word QW Output word

DW Data word from a

data block

DB_ Data from the

global data block

(DBW,DBD)

DI_ Data word from an

instance data

block (DIW,DID)

IN Input parameter of

an FC or FB

IN_OUT Through

parameter of an

FC or FB

OUT Outputparameter

of an FC or FB

L Temporary

variable, local

data

DIX Static variable of

an FB



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The following table lists the linking operations in STEP 5 and their STEP 7 equivalents.

STEP 5 STEP 7

Operation Operand Operation Operand

Link words

with AND,

OR and

EXCLUSIVE

OR

L IN1 L IN10

L IN1 L IN20

AW OW

XOW

AW

T OUT T OUT

L IN1 L IN10

L IN1 L IN20

OW OW

T OUT T OUT

L IN1 L IN10

L IN1 L IN20

XOW XOW

T OUT T OUT

IN1,IN1= IN10,IN20=

IW,QW,FW,DW,KF,KM,KH IW,QW,MW,DW,IN,

IN_OUT,constant

OUT=

QW,FW,DW OUT=

QW,MW,DDW,DIW,OUT,

IN_OUT

Link double-

words

Not

possible

L IN30

L IN40



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with AND,

OR and

EXCLUSIVE

OR

AD

T OUT

L IN30

L IN40

OD

T OUT

L IN30

L IN40

XOD

T OUT

IN30,IN40=

ID,QD,MD,DBD,DID,

IN,IN_OUT,constant

OUT=

QW,MW,DDD,DID,OUT,

IN_OUT

8. CONVERSION OF STRINGS

The converter thatis part of the Basic Package, converts the data formats of the STEP5 program

correctly. The word-oriented DB in STEP5 is converted into a byte-oriented DB in STEP7. String data

types (STEP5 type 'KC' or 'C') are stored differently in STEP7. The first two bytes contain a length

code. A converted program block doesn't take this code into accountand accesses incorrectly, i.e.

offsetby2 bytes.

In the S5, with absolute addressing, the data is accessed in a DB. When converting to S/ this cannot

be converted automatically. Therefore, after conversion, you mustadjust the appropriate program

settings manually in S7.



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9. CONVERSION OF BLOCKS

STEP 7 includes a S5/S7 converter which can be used to convert S5 to S7 programs as complete as

possible. This converter has certain particularities:

Converting special commands for CPUs of the SIMATIC S5 135U and SIMATIC S5 155U

series is notpossible.

This applies to access to the area systemdata of the CPU (e.g.: L BS 0..255 / T BS 0..255).

The modules in the library "S5-S7 Converting Blocks" (visible in the SIMATIC Manager

with File >Open >Libraries in "Standard Library") are intended only for conversions of

existing S5 programs to S7 programs. They cannotbe used in newly created S7 programs.

This STEP 7 libraryoffers the following standard solutions:

Functions of floating point arithmetic:

Name Explanation Number

GP_ADD Add floating point numbers FC 63

GP_DIV Divide floating point numbers FC 66

GP_FPGP Change fixedpoint number to floating point number FC 61

GP_GPFP Change floating point number to fixed point number FC 62GP_MUL Multiply floating point number FC 65

GP_SUB Subtract floating point numbers FC 64

GP_VGL Compare floating point numbers FC 67

RAD_GP Extract rootof floating pointnumbers FC 68

Signal functions:


MLD_ED Message of firstvalue with double flashing light,

bitwise, A

FC 76

MLD_EDK Message of first value with double flashing light,

bitwise, A+M

FC 80

MLD_EDW Message of first value with double flashing light,

wordwise, A

FC 72

MLD_EDWK Message of firstvalue with double flashing light, FC 78



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wordwise, A+M

MLD_EZ Message of firstvalue with single flashing light,

bitwise, A

FC 75

MLD_EZK Message of firstvalue with single flashing light,bitwise, A+M

FC 79

MLD_EZW Message of first value with single flashing light,

wordwise, A

FC 71

MLD_EZWK Message of first value with single flashing light,

wordwise, A+M

FC 77

MLD_SAM Collected message, bitwise FC 74

MLD_SAMW Collected message, wordwise (sound alert) FC 73

MLD_TG Clock generator FC 69

MLD_TGZ Clock generator (timing element) FC 70

Integrated functions:


COD_B4 Change BCDnumber to 16 bitdual number FC 81

COD_16 Change 16 bitdual number to BCDnumber FC 82MUL_16 Multiply 16 bit dual numbers FC 83

DIV_16 Divide 16 bit dual numbers FC 84

Calculating functions:


ADD_32 Add 32 bit dual numbers FC 85

DIV_32 Divide 32 bit dual numbers FC 88

MUL_32 Multiply 32 bit dual numbers FC 87

RAD_16 Extract roots of 16 bit dual numbers FC 89

SUB_32 Subtract 32 bit dual numbers FC 86

Registry functions:


REG_FIFO Buffer memory (FIFO) FC 92



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REG_LIFO Stack register (LIFO) FC 93

REG_SCHB Bi-directional shiftregister, bitwise FC 90

REG_SCHW Bi-directional shiftregister, wordwise FC 91

Copying data areas:


DB_COPY1 Copy data block, directassignment of parameters FC 94

DB_COPY2 Copy data block, indirectassignment of

parameterization

FC 95

Special functions:


LADEN Load scratchpad memory FC 97

RETTEN Save scratchpad memory FC 96

COD_B8 Change BCD number to 32 bitdual number FC 98

COD_32 Change 32 bitdual number to BCDnumber FC 99

Values Read and Write:


AE_460_1 Read analog value FC 100




AE_464_1 Read analog value FC 104AE_464_2 Read analog value FC 105



PER_ET1 Read and Write for extended periphery (direct

assignmentof parameters)

FC 110

PER_ET2 Read and Write for extended periphery (indirect

assignmentof parameters)

FC 111

RLG_AA1 Output analog value FC 108



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RLG_AA2 Output analog value FC 109

Note:

When using the standard functions FC100-FC111, the peripherial addresses are to be observed (see also

online help for these blocks). The refreshment of the process image depends on the S7 CPU. If you assign

a partly peripherial address (between 1 and 8) to the address, these addresses are not taken into account

in the cyclic refreshmentof the process image.

Mathematical functions:


A2_H_A1 AKKU 2 to the power of AKKU 1 FC 125

ARCCOS Arc cosine (x) FC 117ARCCOT Arc cotangens (x) FC 119

ARCSIN Arc sine (x) FC 116

ARCTAN Arc tangent (x) FC 118

B_LOG_X General logarithm Iog (x) to basis b FC 122

COSINUS Cosine (x) FC 113

COTANG Cotangent (x) FC 115

E_H_N e to the power of n FC 123

LG_X Decade logarithm Iog (x) FC 121

LN_X Natural logarithm ln (x) FC 120

SINUS Sine (x) FC 112

TANGENS Tangent (x) FC 114

ZEHN_H_N 10 to the power of n FC 124



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10. ANALOG VALUES

If you have replaced the S5 analog modules with S7 analog modules, you can no longer use any standard

blocks, except for the R64 block, because they can only be interconnected directly with the inputs and

outputs of the analog modules. However, since the modules have different resolutions, the standard blockswould run the risk of providing false results.

However, if you have not used any standard interface in the S5 program, you can supplement the existing

program byconverting the analog values.

The S5 modules workby defaultwith a resolution of 2048units - however, the S7 modules have a normal

resolution of 27648 units (S7 format).

You must take this change in resolution into consideration in the the S5 programso as not to falsify the

result of the evaluation.

The diagrambelowclearly shows the interrelationships.

Fig. 1: Overview

diagramof

values

transferred

between the

groups

Definition of tags:

a =Output value of S5 analog input module

b =Output value of S5 processing

c =Output value after analog output module

d =Output value of S7 analog input module

e =Converted value for output to S7 analog output module

X =Units (resolution) of S5 analog module

Y =Units (resolution) of S7 analog module



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If you use an S5 standard interface with a resolution of 2048 units, the following conversion factor applies:

Formula 1: Conversion of output values fromthe S7 input module

The values determined in the S5 controller must also be converted for the analog output. The output

modules of the S5 series have a default resolution of 1024 units. In this context, therefore, the conversion

formula is:

Formula 2: Conversion of output values of old S5 program

Some S5 interfaces do not workwith 2048/1024units, for example when using the R64 block. This block

uses a resolution of 16384 units. In general, the following two formulas apply for converting analog value:

Formula 3: General formula for converting output values fromthe S7 inputmodule

Formula 4: General formula for converting the old S5 program

Note

When using a 4-20 mA interface, you cannot change the formatbecause S7 modules do not cause a shift

of 512 units.

A special example shows the conversion clearly.

Example

You replace an S5 analog input module AE460 with an ET 200S. Furthermore, you replace the S5 analog

output module with an S7 module. In the S5 programyou use the evaluation with the R64 block. To be able

to continue using the calculation with the existing program, before processing the analog value in the S5

controller, you have to convert the new input signal.

Now you can no longer connect the analog values directly with the input of the R64 block. The value from

the analog module has to be converted with a factor (this factor cannotbe setwith the COM REGparameter) and has to be preset on the block as R64analog format. Once the output values have been



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calculated bythe R64 block, you must once again convert the R64 analog formatvalues with a factor and

then output them to the S7 analog output module.

As described above, the R64 block works with a resolution of 16384 units (analog format). Therefore you

have to recalculate the conversion factor. The combination of formulas 3 and 4 applies.

Formula 5: Conversion for output values of the S7 module when using the R64 block

Formula 6: Conversion for output values of the S5 controller



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11. BIT BYTE INDIRECT ADDRESSING

When calculating the address in STEP 5, bits 12 to 15 are used for the interimresults. But these bits are

notneeded for indirect addressing in STEP 5. Unlike DO instructions (e.g. "B MW") in STEP 5, in STEP 7

addressing is via double-words, because of the extended address area. With the instruction in STEP 7, anarea (E, A, M), an access range (bit, byte, word and double-word) and an address are specified. The

address contains the byte number.

The structure of the address register must be observed when an address is presetvia the Accu:

RRR: area identifier

B...B: byte address

XXX: bit address

Fig. 01

If the program is now converted to STEP 7, then when bits 12 to 15 are used by STEP 7 the system

changes the addresses.

Fig. 01 shows an example of a bit pattern "W#16#221". After conversion, the address "33.2" is calculated.

Fig. 02



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Fig. 02 shows the same program, but with the bit pattern"W#16#1221". The leading "1" is not evaluated by

STEP 5. After conversion, however, the address "35.2"is calculated bySTEP 7. The reason for this is that

the leading "1"at the bit point is placed bythe systemin the byte address with value 2.

Fig. 03

Remedy:

If you can't ensure that bits 12 to 15 are not used, then change the two move commands as follows.

SLW 5 to SLW 12.

SRW 5 to SRW 12.

After conversion, however, the correct address "33.2" is calculated in STEP 7.

Fig. 04



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12. PID CONTROL PARAMETERS

When converting a control block fromS5 to S7, you need to be aware not all parameters available in the S5, can

be converted to S7.

The parameters in the S5 and the S7 are not identical. In the following two tables parameters are explained.

Parameters S5 Meaning

TI Time constant

TD Derivative time

KP Proportional coefficient

TV Derivative time

TN Reset time

TA Sample time

T1 D component lag

Table 1: Control parameters S5

Parameters S7 Meaning

TI Integral action time (reset time)

Gain Gain (amplification factor)

TD Derivative time

TM_LAG D component lag

Table 2: Control parameters S7

In the following table, you will find conversion of control parameters fromS5 to S7. The conversion factors (1000,

1/1000) for KP; R and TI within OB 251 of the S5 are not included.

Control parameters

Controlling

S5

Controlling

S7

Conversion

S5 ->S7

Remarks

KP x R Gain Gain =KP x R depends on the controller in the S 5

typically R=1

TI =TA :

TN

TI =TN TI(S7) =TA :

TI(S5)

TI and TN are used in the S 5

TD =TV :

TA

TD (S7) =

TV

TD(S7) =

TD(S5) x TA

TD and TA are used in the S5

T1 TM_LAG TM_LAG =1 rarely existing in the S5 (configured to TV : 5)



Table 3: Conversion of control parameters

After converting an S5 program with a blockcall an error message is issued when compiling the STL

source created with reference to the order of the interconnected parameters:

Error message: Wrong order of parameters for Symbol can lead to permutations/shifts

In S5 the parameters are sorted in the order in which they are used in the program. In S7 the parameters

are sorted according to type in the order IN, OUT, IN_OUT. The converter adopts the actual parameters of

block calls fromthe S5 withoutany changes. Therefore the order of parameters in the STL source is not

correct.

Remedy:

If converted files fromthe S5 program contain block calls in which the order of the actual parameters does

not match the order in the declaration, you can easily correct this byresorting using Cut and Paste. You

must make sure that the actual parameters are sorted in the same way as the declarations of the blocks

called. Then the STL source can be compiled withoutany errors.

The SFC20 block described in the manual "STEP 7 Standard and SystemFunctions" copies the contents

in the reverse order to that of the correspondingblock with S5.

If a program is converted fromS5 to S7, then watch out for the following:

If the source area and the target area overlap, the block cannotbe simply replaced when converting to S7.

The conversion with NOT R... and NOT S... (negation of the VKE) results in having the same value of the

VKE (connection result) after the operation as before the operation. One of the two following "S/R-

commands" is executed in any case, so that the resultwill always be correct. The SET command, however,

changes the VKE and should not be used for this issue.

Converting S5 data to STEP 7 is not possible if the data is on write-protected media (e.g. on a write-

protected floppydisk). In this case copythe S5 data into a writable directory and then convert this project –

copied into the directory – with the S5/S7 converter.

For printing out converted S5 programs it is recommended to choose the "DIN A4 landscape" format. If you

use the "DIN A4 portrait" format, depending on the printer driver used, characters fromthe end of the line

mightbe printed at the beginning of the nextline. By choosing the landscape format your program printouts

will be more legible.

s5 to s7 conversion tips v1

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