Simatic S7-300 immediate inputs

Gromit

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• May 21, 2007

• #1

Hello,

How can we read instantlly a digital input, indepentantly from the process input image? I suppose with the peripherial inputs PIB or PIW.
In Step7 micro/win we have normally open immediate command.

Regards

 

Nick B

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Mar 2007

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• May 21, 2007

• #2

As you mentioned you will have to use PIW xxx etc. You cannot get at individual inputs. You therefore move to working area and operate on those bits. Smallest increment is a byte.

Nick

 

Gromit

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• May 21, 2007

• #3

Hi,

But can I move PIB0 to MB10, then read M10.0 instantlly, before the cycle is finished and a new input process image is created.

Regards

 

WJhsson

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• May 21, 2007

• #4

Hi Gromit,

You can update the specifik byte to PII and then access the specifik bit.

l pib 0
t ib 0
a i0.4

BUT if you use that method you have to be careful so you don´t make this update in a bad place of the scan.


regards Wille