CODESYS - the IEC 61131-3 automation software

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PostPosted: Fri Jun 03, 2016 8:05 am 
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Joined: Wed Jun 01, 2016 4:39 am
Posts: 1
Dear All,
As titled, may i know how to make PID function works in inverse mode? I would like to make a PID blower control where the set value is wind pressure. In normal mode, blower speed need faster to make higher pressure. But when i select reverse mode, blower speed need slower to make higher pressure. In Tia portal , there is a bit for reverse mode. So i wonder whether reverse mode is available in CoDeSys or not. I had been searched in internet about the method but no result. Hope you all can help me about this. Thank you


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PostPosted: Sun Jun 05, 2016 8:29 pm 
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Joined: Thu Jun 14, 2007 9:49 am
Posts: 974
what PID function is used.
when you make the P action negative it will work.

This is standard theory.

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