s7300 variables

8/2/2019 S7300 Variables

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KUKTEM

Working with STEP 7-300 V5.1

Adriad CHOO Siemens S7 introduction 08.03.2012 1/30


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KUKTEMWhat you will learn?

Defining Symbols

Contact switches and Logic gates


p- ops

Timers

Counters


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KUKTEMBasic LAD instruction

What is LAD?

stand for Ladder Logic

graphic programming language

syntax of the instruction is similar to circuit diagram

consists of elements and boxes which are connect graphically to form networks



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KUKTEMConfiguration and Element of LAD

individual element no need address or parameters as this is a Logic Gate

Elements and boxes can be classify as following group


individual element need to enter address and value as this is an Output


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individual box with line indicating inputs and outputs

fill in the input parameters

S7 place the output information for you


EN/ENO function principles

EN not activated ENO not activated

EN activated ENO also activated if the box function executed (comparison done) without error EN activated ENO not activated if the box function executed (comparison done) with error


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KUKTEMMemory area and their functions

Global

1

8

16

32


Variables

(for all

programs)(Flag words)

For Analogue use only


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Global

Variables

(for all

programs)


Local

Variables

(only for aparticular

program)

Counter and Data Block are only meant for High- end PLC programming


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KUKTEMBit logic instructions

Normally open contact

If the instruction used is series, its combines the result of its signal state check according to the AND

truth table

If the instruction used is parallel, its combines the result of its signal state check according to the OR

truth table


M30.0 is energized when input M10.0 AND M10.1 are ON

M30.0 is energized when input M20.0 (OR) is ON


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Normally close contact

If the instruction used is series, its combines the result of its signal state check according to the AND

truth table

If the instruction used is parallel, its combines the result of its signal state check according to the OR

truth table


M30.0 is energized when input M20.0 is OFF

M30.0 is energized when input M10.0 and M10.1 are ON

Switching between open & closed contact is not possible. Need to delete and re-insert!


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Output coil

If the power can flow across the circuit to reach the coil, the power energized the coil (green line)

If the power cannot flow across the entire circuit to reach the coil, the power cannot energized the coil


M30.0 is energized when input M10.0 and M10.1 are ON M30.0 is energized when input M20.0 is OFFM30.1 is energized when input M10.0 and M10.1 and M20.1 are ON M30.1 is energized when input M20.0 is OFF and M20.1 is ON


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Midline output (especially as an indicator)

Intermediate assigning element that store the last Result of Logic Operation (RLO) status

Function as normal contact, cannot be located at the end of network or end of an open branch


M40.0 is energized when input M10.0 and M10.1 are ON. As such, M40 is the RLO of M10.0 and M10.1

M40.1 is energized when either midline coil M40.0, input M10.2 or M10.3 is Off

M40.2 and M30.0 are energized when M40.1 is not energized


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Invert power flow (Logic NOT)

Reverse the RLO status


M30.0 is energized when input M10.0 is off or M20.0 and M20.1 are OFF

M30.0 is not energized when M10.0 is ON or M20.0 and M20.1 are ON


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Set coil

Only execute when the RLO = 1, these instruction sets the specified address to 1

If RLO = 0 the instruction has no effect on the specified address. The address remains unchanged


M30.0 energized when input M10.0 and M10.1 are On or M20.0 is OFF

If the RLO of the branch is 0, The signal state of the M30.0 remains

unchanged


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Set counter value

To place a preset value into the counter you specified (max. count is 999)

The transition is executed only if the RLO has a positive edge detection

Using Functions in Bit Instruction


If the positive edge of the RLO detected, the counter C1

is preset with a value 100

If there is no positive edge, the preset value of the counter

remains unchanged


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Up counter coil

Increments the value of the specified counter by one if RLO has a positive edge and the value of the

counter less than 999 (if above 999, use Register)

If the counter has value 999, the value of the counter does not change even RLO has a positive edge



If there is a positive edge of RLO the value of counter C1

Incremented by one


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Down counter coil

Decrements the value of the specified counter by one if RLO has a positive edge and the value of the

counter more than 0

If the counter has value 0, the value of the counter does not change even RLO has a positive edge



If there is a positive edge of RLO the value of counter C1

decremented by one


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Pulse timer coil

Produce a signal state of 1 after positive edge of RLO detected as long as the timer is running

Produce a signal state of 0 after the timer expire or the RLO change to 0 before timer expire(As according to the

preset time or the input,

whichever shorter



T1 is on after RLO detection and as long as the timer

T1 is running

T1 is off after timer T1 expire or M10.1 off before timer

T1 is expire


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Extended pulse timer coil (TP)

Produce a signal state of 1 after positive edge of RLO detected as long as the timer is running

Produce a signal state of 0 after the timer expire without regard the negative edge of the RLO(As according to the

preset time only)



T1 is on after RLO detection and as long as the timer

T1 is running without regard the negative edge of the RLO

T1 is off after timer T1 expire


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On delay timer coil (Timer ON)

Produce a signal state of 1 after positive edge of RLO and a specified time elapsed without error and

RLO is still 1

Produce a signal state of 0 if RLO change to 0 while the timer is running, the timer will stop



If positive edge in the RLO, the timer T1 startIf the time elapses and the M10.1 still ON the M30.0 will switch to ONIf M10.1 change from 1 to 0 before timer T1 expired, the timer will stop and M30.0 remain OFF


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Retentive on delay timer coil

Produce a signal state of 1 after positive edge of RLO and a specified time elapsed without error even

if the RLO change to 0 before the time elapsed

Produce a signal state of 0 only when you reset the timer (external input to reset)



Timer T1 start after positive edge of RLO, T1 will turn on after

A specified time elapsed without regard negative edge of RLO

T1 will remain on until reset by the reset instruction (external)


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Off delay timer coil (Timer OFF)

Produce a signal state of 0 after negative edge of RLO and a specified time elapsed without error and

RLO is still 0

Produce a signal state of 1 if RLO change to 1 while the timer is running, the timer will stop



If M10.1 change from 1 to 0, the timer startIf M10.1 remain 0 after a specified time elapsed, T1 will turn offIf M10.1 change back to 1 while the timer is running, the timer will stop


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Positive RLO edge detection (similar to counter but count above 999)

recognized a change status of RLO from 0 to 1, the last state of the RLO will store in one address




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Negative RLO edge detection (similar to positive RLO edge detection but used on NPN sensor)

recognized a change status of RLO from 1 to 0, the last state of the RLO will store in one address




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Address Positive edge detection (similar to AND gate)

recognized a change status of address1 (exp: a sensor) from 0 to 1, the last state of the address1

will store in address2



In this case, I0.3 and

M0.0 is combined asone


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Address negative edge detection (similar to NAND gate)

recognized a change status of address1 from 1 to 0, the last state of the address1 will store in

address2




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Set Reset flip-flop

Signal state is 1 if 1 at the S input and 0 at the R input

Signal state is 0 if 0 at the S input and 1 at the R input

Signal state is 0 if 1 at the S input and 1 at the R input (therefore R is the Master)

Using Functions in Block Instruction


Signal state and address is 1 if 1 at the S input and 0 at the R inputSignal state and address is 0 if 0 at the S input and 1 at the R inputSignal state is 0 if both S and R input are 1


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Reset Set flip-flop

Signal state is 0 if 1 at the R input and 0 at the S input

Signal state is 1 if 0 at the R input and 1 at the S input

Signal state is 1 if 1 at the S input and 1 at the R input (therefore S is the Master)



Signal state and address are 0 if 1 at the R input and 0 at the S inputSignal state and address are 1 if 0 at the R input and 1 at the S inputSignal state and address are 1 if both S and R input are 1


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KUKTEMTimer Functions in Block Instruction

Time value

Method used to preload a value to a timer

i. w#16#wxyz

- Where w = time base (time interval or resolution)

- Where xyz = time value in BCD format (up to max. 999)


ii. S5T#aH_bbM_ccS_ddMS (exp: 2hr42m36s = S5T#2H42M36S)

- Where a = hours, bb = minutes, cc = seconds, d = milliseconds

- Time base selected automatically, the value is rounded to the next lower number

with that time base (exp: 42m36s to 43m)

- This is the preferred method used


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Time base

Bit 12 & 13 of the timer word contain the time base in binary code.



Resolutions and ranges


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Choosing the right timer

5 types of timer




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Pulse timer



Extended pulse timer


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On delay timer



Retentive on delay timer


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Off delay timer




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KUKTEMCounter Function in Block Instruction

3 types of counter

Up down counter

- Input S = 1, set the counter with a preset value

- Input R = 1, reset the counter with value 0

- Input CU change from 0 to 1 and the value of the counter less than 999, the counter value

increase by one


- ,decrease by one

- Output Q = 1, if counter value more than 0


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example

Counter Function in Block Instruction


orce . on w oa to an _

Reset M10.2

Set M10.3 will reset CV and CV_BCD to 0

Reset M10.3 to 0

Set to 1 to increase CV by one

Set to 1 to decrease CV by one


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Up counter




increase by one



- u pu = , coun er va ue more an


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Down counter




decrease by one



- u pu = , coun er va ue more an

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