Old FX w/ PID loop

[waynes]

Hi All, As per the topic, anyone done this before?

[kaare_t]

GX Developer or GX IEC Developer?

[Dariusch]

What FX PLC do you have? FX, FX0s, FX1N etc? and what kind of AI/AO-card do you have connectct and how many PID do you need? Best regards Dariusch

[waynes]

Hi Gents, Sorry for the delayed reply- OK, first of all I'm using GX Developer. I have tried implementing a PID loop in the FX using the FX2Ns' format with regards to parameters and register layout. I have seen no response out of the PID; also setting the kp, ti and td/kd values triggered no response. I have looked for a manual on the mitsubishi-automation.com website but no such luck. The PLC has a FX cpu.

[Dariusch]

Hi Waynes, Please download the manual "xxx" in the download section. Section 5.9.8 PID (FUC 88) there is all the info that you need. Some point to consider: The PLC FX2N has to be version 3.11 and up. It is 16bit operational. It data area for the control-loop (s3) uses 25 consecutive dataregisters You can not use registers above D975 for control-loop (s3). Best Regards Dariusch

[waynes]

"xxx"? Dariusch, I know that FX2N has PID function and all you mentioned. I have used it extensively before - My question is if anyone has detail on the FX CPU. Its an OLD CPU.

[Dariusch]

Hi Waynes, My bad. Did not read your post correctly. If you look in the manual The PID-function covers FX1s and upwords. So I realy think you can not use the PID-function. You have lookede in the download section for the manual? I wil try a quick search for you. Best regards. Dariusch

[waynes]

I have made some extensive searches myself; I only ask here as a last resort. Thought that maybe someone might have old manuals somewhere....

[Dariusch]

Please try this link http://www.beijer.se/web/web_aut_se.nsf/do...125728E0058E17B

[kaare_t]

For the FX-CPU, download this manual and check out section 5-102 (page 228): http://www.beijer.no/web/web_aut_no.nsf/do...125728E0058E17B