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Hello Everyone,
My project utilizes the standard FB126 "PNIODiag" for fieldbus diagnostics. The block works well and we get our status words from DB200 for each profibus slave, however, there is one problem.
Bit 8 (1st bit of 2nd status word) is a 'had failed' sign, intended for use in the situation that the failure may be only one scan cycle and you still have indication that the failure occurred. This works, however, once this bit is set true there is no means to reset it. I have written code to directly force this bit to false but once the bit immediately returns to true.
How can I reset this bit? A solution from within the PLC itself (as opposed to hardware configuration or PLC reset) is necessary.
Reference documentation here:
https://support.industry.siemens.com/cs/attachments/98278878/98278878_FB126_PNIODiag_en.pdf
Thanks!
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