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Old May 7th, 2009, 04:05 AM   #1

O_P is offline
Join Date: Apr 2009
Location: Sweden
Posts: 11
Siemens S7 314, First Scan bit?


Is there any "system bits" in siemens PLC's?

I whould like to find a bit that is "1" only in the first scan cycle. Or at the start up of CPU..

I've searched a litle in different manuals and online-help.
But I've only found small instruktions with OB100 and such.

So are there no default system bits for this function??

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