I'm using a S7-1200 1214 CPU with version 10.5 TIA software to control a chilled water loop- but even with compact PID instruction enabled and everything working the analog output has no effect in auto. If I put the PID DB in manual it operates the modulating valve (4-20mA output) fine. In the PID loop tuning screen the output seems to operate OK too, and there are no fault codes- anyone have ideas on possible issues? I'm about ready to yank the processor and put in something else.