When using the PID instruction, I've used the timer trigger with the DN bit in the rung as I've read. PID works fine. I've included a examine on instruction (auto mode)in the same rung when we are in auto. Does this make sense. Also what is the best method to shut down the CV of the PID when not in auto mode. Thanks for your help. You guys are great. Hopefully I'll get to a point I can start answering some questions.