I am taking over support of a system installed by another provider. I'm new to Mitsubishi, but have been able to pick up most things pretty quickly. I am using an A Series PLC, CPU Model is A1SCPU24-R2. The customer says that once upon a time there was PID control of a valve to control pressure in a process. The PLC here does have an anlaogue output card, but the code only contains a hard-coded value for this output- no modulating control. I have searched high and low through the Mitsubishi documentation (GX Developer Operation Manual, A-Q Series Programming Guide, among others) to see if this CPU is capable of PID control, but with no success. The "Instruction Help" dialog in GX Developer has no entries under PID for this program. Any help greatly appreciated!
