Be aware of the built-in positioning in S7 CPU314IFM

M

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myrne

I've used the built-in positioning function on the Simatic S7 CPU314IFM and been very frustated when counter loses or add pulses sporadicly. When I contacted Siemens they only replyed something like this: read the f*****g manual! (But when I searched there own site I found a very interesting page in the FAQ
(http://www4.ad.siemens.de/csinfo/livelink.exe/2973172?func=ll&objId=2973172&objAction=csView&lang=en&open0=-75-1-77-80-&aktprim=0&nodeID0=4000155&siteid=cs)
(entry ID:2973172)
that confirmed what I thought the hole time, the built-in function have a flaw in the logic that corrupt the counting process sometimes.
 
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