Be aware of the built-in positioning in S7 CPU314IFM


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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
(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.