Posted 11 Jan 2020 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. Share this post Link to post Share on other sites
Posted 20 Jan 2020 Sounds like someone wrote a custom block for a feed forward PID loop. Is this a wastewater plant? Share this post Link to post Share on other sites
Posted 7 Mar 2020 (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 7 Mar 2020 by relaxc personnal Share this post Link to post Share on other sites