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Frank_T

Difference between the PID controllers

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Hello,
Do you know what is the difference between the PID controllers PIDFF, PID1 and PIDP1 in a Schneider PLC?
I have to modify a PLC program with a new standard of coding. The new standard use a PIDFF function bloc.
If I change a PID1 bloc for a PIDFF bloc, can I use the same parameters Kp, Ti, Td?
If I change a PIDP1 for a PIDFF bloc, can I use the parameters Ki and Kd to calculating Ti (ti=1/Ki) and, Td (Td = Kd)?
Thanks you for your help.

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What software and plc is this?

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Sounds like someone wrote a custom block for a feed forward PID loop.
Is this a wastewater plant?

 

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Posted (edited)

Hi,

Look at the equations of your PID to know the role of the coefficients. But recently, process control has made progress. Try this trial version (example (V14) and library for the other version)  of relaxc and give me a feedback. Enjoy it

 

your would be kindly to download  by the Schneider site. It is important for me  

 

https://shop.exchange.se.com/en-US/apps/55444/relaxc---critical-process-loop-control---trial-version

 

otherwise you have this link.

ask me :-)

Edited by relaxc
personnal

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