Siemens S7 one shot

Brian H

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• Oct 21, 2005

• #1

Hi
I am new to step 7, can anyone tell if there is one shot function on siemens PLC's. And if so where do they hide it.

 

JesperMP

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• Oct 21, 2005

• #2

If it is an S7-300 or S7-400 then it is the --[P]-- instruction in LAD.
In STL it is called "FP" (for positive "flanke").
Dont know what it is called in an S7-200.

An inverted one shot is --[N]-- and "FN".

 

FROMER

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• Oct 21, 2005

• #3

In s7200 it is called EU (edge up) or in LAD just P (puls)

 

jvdcande

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• Oct 21, 2005

• #4

Brian,

there is not one one-shot function, but four:

1. The one-shot rising on an address: POS
2. The one-shot falling on an address: NEG
3. The one-shot rising on the RLO: P
4. The one-shot falling on the RLO: N

In ladder all these instructions can be found in the instruction browser under "Bit Logic".

Kind regards,

 

Brian H

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• Oct 21, 2005

• #5

Thanks Guys - found them