PROGRAMMABLE LOGIC CONTROLLER

POWERSUPPLY

FIELD INPUTS CONTROL

PROCESS/MACHINE

INPUTMODULE

CPU

PROGRAM MEMORYOUTPUTMODULE

PLC

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

CPU

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

.7

.6

.5

.4

.3

.2

.1

.0

0 1 2 3 4 5 6 7

8 9 10 11 12 13 14 15

PLC

AI 0.0

OPRATIONOPRAND

IDENTIFIERPARAMETER

OPRAND

Start scan monitortime

Load process inputimage

Call OB1(scan user program)

Transfer processoutput image

System program

Digital inputs

Digital outputs

:JUPB1:BE

::

:AI0.0::

:=Q4.0:BE

PII

PIQ

OB1

PB1

User program

Software Blocks used in program

PB 0………255

OB 1………255

SB 0……..255

DB 2……..255

FB 0……….255

Program blocks:for plants specific functions

Function blocksfor standardized function,independent of particular plant

Organization Blocksfor organization and supervision of program

execution called by the system program.

Sequence blocks:for programming sequences(sequential control system

Data blocksfor the storage of fixed and variable data

I0.1( )

I0.0 Q4.0

LAD

:AI0.0:AI0.1:=Q4.0

STL

CSF

& Q4.0I0.0

I0.1=

K1

I0.1

Q4.0

I0.0

CIRCUIT DIAG.

S1

K1

24v

S2

0v

INPUT MODUL

PLC

OUTPUT MODUL

Check for 0&Check for 1

NO Contact NC Contact

WhenActuated

When NotActuated

WhenActuated

When NotActuated

1 0 0 1 STL

FBD/CSF

LAD

Representation Check for 1 Check for 0

A…O...

AN..ON..

(1)

Q4.0=>1

I0.5

I0.0

&

&

=

I0.1

I0.2

I0.3

I0.4

CSF

O(AI0.0AI0.1AI0.2)O(AI0.3AI0.4)0I0.5=Q4.0

STL

I0.3

I 0.0

I0.5

Q4.0I0.1 I0.2LADDER

I0.4

K1

I0.3

I0.1

10.4

I0.5

Q4.0

I0.0

I0.2

AND-BEFOREOR-OPERATION

LADDER

( )I0.0 I0.3 I0.5 Q4.0

I0.2 I0.4

I0.2

I0.0

I0.3

I0.4

>=1

>=1&

=

I0.1

I0.2

I0.5

Q4.0

CSF

:A(:OI0.0:OI0.1:OI0.2):A(:OI0.3:OI0.4):AI0.5=Q4.0

STL

I0.5

Q4.0

OR-BEFOREAND-OPERATION

I0.0

I0.3

I0.1

I0.4

I0.2

K1

Contacter K1 on when S1 is operated and S2 is not operated

I0.0 I0.1Programmable

ControllerQ4.0

K1

24v

S1 S2

0v

I0.1( )

I0.0 Q4.0LAD

:AI0.0:ANI0.1:=Q4.0

STL

CSF

& Q4.0I0.0

I0.1=

Contacter K1on when S1 is operated and S2 is not operated

:ANI0.0:AI0.1:=Q4.0

STL

I0.0 I0.1Programmable

ControllerQ4.0

K1

24v

S1 S2

0v

I0.1( )

I0.0 Q4.0LAD

CSF

& Q4.0I0.0

I0.1=

Contacter K1on when S1 is operated and S2 is not operated

I0.1( )

I0.0 Q4.0LAD

:AI0.0:AI0.1:=Q4.0

STL

I0.0 I0.1Programmable

ControllerQ4.0

K1

24v

S1 S2

0v

&

CSF

Q4.0I0.0

I0.1=

Two out of three

Input=I0.0,I0.1,I0.2 Output=Q4.0

STL

:O:(:AI0.0 :AI0.1:):O:(:AI0.1:AI0.2:):O:AI0.2:AI0.0:):=Q4.0

( )

LAD

I0.0 I0.1 Q4.0

I0.1 I0.2

I0.2 I0.0

I0.0

I0.1

I0.2

I0.0

&

&

&

>=1= Q4.0

I0.1

I0.2

CSF

Three inputs are there I 0.0 , I 0.1, I 0.2 .After tripping compressor all inputs have state change .Give the 1st out for above inputs .

S

R Q ( )

S

R Q ( )

S

R Q ( )

Q4.0

Q4.1

Q4.2

Q4.1 Q4.2

Q4.2Q4.0

Q4.1Q4.0

I0.0

I0.3

I0.3

I0.3

I0.1

I0.2

Write a program in STL/LAD/CSF for the given below

TASK:

In the process there are three temperature sensors(e.g. T1,T2,T3)two pressure sensors(e.g.P1,P2)and enable input.

1 All three temperature sensors i.e.T!,T2,T3 should on.2 OR both the pressure transducers should on.3 OR enable input should be activated.

T1

T2

T3

P1

P2

Note:normal condition=NCAbnormal condition=NO

Data1 Temp. input T1=I0.02 Temp input T2=I0.13 Temp input T3=I0.24 Pressure input P1=I0.35 Pressure input P2=I0.46 Enable input=I0.57 Output Q=Q4.0

And before Or

I0.3 I0.4

I 0.0

I0.5

Q4.0I0.1 I0.2LADDER

=>1

I0.5

I0.0&

&

=

I0.1I0.2I0.3

I0.4

Q4.0

CSF

Data1 Temp. input T1=I0.02 Temp input T2=I0.13 Temp input T3=I0.24 Pressure input P1=I0.35 Pressure input P2=I0.46 Enable input=I0.57 Output Q=Q4.0

STL

O(AI0.0AI0.1AI0.2)O(AI0.3AI0.4)0I0.5=Q4.0

Write a program in STL/LAD/CSF for the given below

TASK:

In the process there are three temperature sensors(e.g. T1,T2,T3)two pressure sensors(e.g.P1,P2)and enable input.

1 Any one of three temperature sensors on i.e.T,T2,T3 .2 AND any one of two pressure transducers should on.i.e.P1,P23 AND enable input should be activated.

T1

T2

T3

P1

P2

Note:normal condition=NCAbnormal condition=NO

Data1 Temp. input T1=I0.02 Temp input T2=I0.13 Temp input T3=I0.24 Pressure input P1=I0.35 Pressure input P2=I0.46 Enable input=I0.57 Output Q=Q4.0

OR before AND

LADDER

( )I0.0 I0.3 I0.5 Q4.0

I0.2 I0.4

I0.2

>=1

>=1&

=

I0.0I0.1I0.2

I0.3

I0.4

I0.5

Q4.0

CSF

:A(:OI0.0:OI0.1:OI0.2:):A(:OI0.3:OI0.4:):AI0.5=Q4.0

STL Data1 Temp. input T1=I0.02 Temp input T2=I0.13 Temp input T3=I0.24 Pressure input P1=I0.35 Pressure input P2=I0.46 Enable input=I0.57 Output Q=Q4.0

K1 K1

HOLDON

OFF

ONHOLD

OFF

OFFPRIORITY

ONPRIORITY

SET RESET BLOCK

S

R S

R

Q Q

RESET PRIORITY

SET PRIORITY

I0.0 I0.1Programmable

ControllerQ4.0

K1

24v

S1 S2

0v

ON OFF

SET RESET BLOCK

S

R S

R

Q Q

RESET PRIORITY

SET PRIORITY

I0.0 I0.1Programmable

ControllerQ4.0

K1

24v

S1 S2

0v

ON OFF

S R Q

1

1

1

1

0

0

0

1

0LAST

STATE

PRIORITY

0

RESET PRIORITY

AI0.0SQ4.0ANI0.1RQ4.0

SET PRIORITY

AI0.0RQ4.0AI0.1SQ4.0

CPU AI AQ DI DI DQ DQ AI AI

7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 00123456

127

0

64

68 72

76

PIQPII

127

NON-UTILIZABLE

UNUSED AREAS

7 6 5 4 3 2 1 0Byte 2

Byte 12

Byte 102Byte 103

AI2.2

LIB12

LIW102

LOAD FUNCTION

7 6 5 4 3 2 1 0Byte 4

Byte 66

Byte 92Byte 93

Q4.2

TQB 66

TQW 92

TRANSFER FUNCTION

High byte Accum1 Low byte

High byte Accum1 Low byte

PIQ

TASK

OUTPUT SHOULD EXACTALY FOLLOER OF INPUT

L IW 0T QW 3

STARTINPUT

RESETINPUT

PULSEOUTPUT

t t t

I0.0

KT050.1

I0.1 R Q

BIDE

FW6QW5Q4.7

1T1

PULSE TIMER(SP)LAD/CSF STL

A I0.0L KT050.1

SP T1A I0.1R T1A T1

NOP0 NOP0=Q4.7

t

t

t

TV

STARTINPUT

RESETINPUT

PULSEOUTPUT

t t t

I0.0

KT050.1

I0.1 R Q

BIDE

FW6QW5Q4.7

1T1

PULSE TIMER(SP)LAD/CSF STL

A I0.0L KT050.1

SP T1A I0.1R T1A T1

NOP0 NOP0=Q4.7

t

t

t

TV

KT=CONSTANT=KT400.0IW=INPUT WORD=IW1

QW=OUTPUT WORD=QW6FW=FLAG WORD=FW100DW=DATA WORD=DW255

TIME BASE

0=0.01S1=0.1 S2=1 S3=10 S

STARTINPUT

RESETINPUT

PULSEOUTPUT

t t t

I0.0

KT050.1

I0.1 R Q

BIDE

FW6QW5Q4.7

1T1

LAD/CSF STLA I0.0

L KT050.1SE T1A I0.1R T1A T1

NOP0 NOP0=Q4.7

t

t

t

EXENDED-PULSE TIMER

E

t

TV

TASKTWO FLASHING LIGHTS USING TIMER

(1) L1& L2 SHOULD BE FLASHING WHEN SWITCH S1 IS ON.(2)STATUS OF LAMPS L1&L2 MUST BE OPPOSITE OF EACH OTHER(3)THE TIME FOR FLASHING FOR BOTH LAMPS SHOULD BE SAME(4)WHEN SWITCH S1 IS MADE OFF FLASHER SHOULD STOP.

T1

AI0.0ANQ4.8LKT030.1SET1NOP0NOP0NOP0AT1=Q4.7

AI0.0ANQ4.7LKT030.1SET2NOP0NOP0NOP0AT2=Q4.8

I0.0

KT050.1

NOP0 R Q

BIDE

NOP0NOP0Q4.7

1

TV

I0.0

KT050.1

NOP0 R Q

BIDE

NOP0NOP0Q4.8

1

TV

Q4.7

Q4.8

T2

E

E

STARTINPUT

RESETINPUT

OUTPUTt t

I0.0

KT050.1

I0.1 R Q

BIDE

FW6QW5Q4.7

T

T1LAD/CSF STL

A I0.0L KT050.1SD/SR T1

A I0.1R T1A T1

NOP0 NOP0=Q4.7

t

t

t

ON- DELAY TIMER

O

t

TV

STARTINPUT

RESETINPUT

OUTPUTt

I0.0

KT050.1

I0.1 R Q

BIDE

FW6QW5Q4.7

T

T1LAD/CSF STL

A I0.0L KT050.1

SS T1A I0.1R T1A T1

NOP0 NOP0=Q4.7

t

t

t

LATCHING ON- DELAY TIMER

E

TV

STARTINPUT

RESETINPUT

OUTPUTt

I0.0

KT050.1

I0.1 R Q

BIDE

FW6QW5Q4.7

O

T1LAD/CSF STL

A I0.0L KT050.1

SF T1A I0.1R T1A T1

NOP0 NOP0=Q4.7

t

t

t

OFF- DELAY TIMER

T

TV

t t

MERQURY LEVEL SWITCH ACTIVATED IN BETWEENBECAUSE OF VIBRATION SO WE HAVE TO PROVIDE

TIMER.USE PROPER TIMER AND WRITE THE PROGRAMEIN LADDER & IN STL ALSO

I0.0

I0.1 R Q

BIDE

FW6QW5Q4.7

O T

TV

T1

KT100.1

STLA I0.0L KT100.1SF T1A I0.1R T1A T1NOP0 NOP0=Q4.7

OFF DELAY TIMER

+M

M +

CONVEYOR 1

CONVEYOR2

ONOFF

TASK(1)WHEN ON PUSH BUTTON IS PRESSED BELT 2 SHOULD BE STARTED

IMMEDIATELY AND BELT 1 SHOULD BE STARTED WITH A DELAY OF 5 SECONDS.

(2)WHEN OFF PUSH BUTTON IS PRESSED BELT 1 SHOULD STOPIMMEDIATELY BUT BELT 2 SHOULD CONTINUE FOR ANOTHER 10 SECOND

(3)THE LED INDICATING THE BELT STATUS ALSO TURN ON COORRESPONDINGLY

DATAI0.0=S1=START PUSH BUTTON.I0.1=S2=STOP PUSH BUTTON.Q2.0=BELT 1 START/STOPQ2.1=BELT 2 START/STOP

BELT 1

BELT 2

START STOP

R Q

T

I0.0S

R Q ( )F0.0

I0.1

F0.0

NOP0

BIDE

NOP0NOP0Q2.1

O

TV

T2

KT100.1

F0.0

NOP0 R Q

BIDE

NOP0NOP0Q2.0

T O

TV

T1

KT050.1

AI0.0SF0.0AI0.1RF0.0

AF0.0LKT050.1SD T1A T1=Q2.0

AF0.0LKT100.1SF T2A T2=Q2.1

R-S FLIP FLOP BLOCKUSED FOR ON-OFF BY

PUSH BUTTONS

ON DELAY TIMER USED TO DELAY START

BUT STOPS IMMEDIATELY

OFF DELAY TIMERUSED TO DELAYSTOP OF BELT2

I0.0

I1.1

I1.2

KC3

I1.3

BI

DI

Q4.7

COUNTINGUP

COUNTINGDOWN

SET

RESET

[FW2]

[QW6]

CU

CD

S

CV

R

COUNTERBLOCK [1]SET INPUT=SETTING

COUNTER TO CV VALUE[2]OUTPUT Q=0 WHENCOUNTER IS AT ZERO

[3]OUTPUT Q=1 WHENCOUNT IS GREATER THAN ZERO

C1

AI0.0CU C0AI1.2L KC009AI1.3L C1T QW3L C1T FW10A C1=Q4.7

STL

IB2

IB3 Q4.7

Z1

Z2

FQ

IB2

IB3 Q4.7

Z1

Z2

FQ

IB2

IB3 Q4.7

Z1

Z2

FQ

IB2

IB3 Q4.7

Z1

Z2

FQ

IB2

IB3 Q4.7

Z1

Z2

FQ

IB2

IB3 Q4.7

Z1

Z2

FQ

COMPARISON BLOCKS

!=

><

>=

>

<=

<

L IB 2L IB 3!=F=Q4.7

L IB2L B3><F=Q4.7

L IB2L IB3>=F=Q4.7

L IB2L IB3>F= Q4.7

L IB2L IB3<=F= Q4.7L IB2

L IB3<F=Q 4.7

EQUAL TO

NOT EQUAL TO

GREATER THAN OR EQUAL TO

GREATER THAN

LESS THAN OR EQUAL TO

LESS THAN

[1]P1,P2&P3 ARE PUMPS[2]START P1 AS START PUSH BUTTON PUSHED[3]P2 SHOULD START AFTER 10 SEC OF START P1[4]P3 SHOULD START AFTER 10 SEC OF START P2[5]P1,P2&P3 SHOULD RUN FOR 10 SEC THEN STOPS ALL THREE.[6]IF IN BETWEEN STOP PUSH BUTTON PRESS STOPS ALL THE THREE PUMPS.

AI 0.0 - START PUSH BUTTONSF 0.0 - SET FLAG F0.0AI0.1 - STOP PUSH BUTONAF0.0- FLAG IS SET AT 1LKT300.1- LOAD VALUE 30 SEC TO TIMER T 0SPT0 - TIMER IS PULSE TIMERAI0.1 - STOP PUSH BUTTONRT 0 - RESET TIMER T 0LCT0- LOAD VALUE IN ACCUMULATOR1TFW4 - TRANFER VALUE FROM ACC. 1 TO FLG W 4AT 0= Q4.3 - STARRT OUTPUT FOR P1LFW4 LKT 200.1< F= Q 4.2 START OUTPUT FOR P2LFW4LKT 100.1< F= Q4.1 START OUTPUT FOR P3AT 0= RF 0.0

[1] READ FOR ZERO & READ FOR ONE

[2] AND -OR FUNCTION

[3] AND BEFORE OR & OR BEFORE AND

[4] R-S BLOCK &LOAD AND TRANSFER

[5] FIVE TIMER BLOCKS

[6] COUNTER BLOCK

[7] SIX COMPARISON BLOCKS