Adamkse Posted December 14, 2017 Report Share Posted December 14, 2017 Hi, I have a PID function block with an embedded PWM function which should turn a heater on and off with a duty cycle. However it is always set on (1). When I monitor the PID UDFB the output from the PWM is 0 but the main ladder has it as a 1. If i drill down further in the PWM UDFB then that is also 0. I don't understand what is happening. Any help would be great. Quote Link to comment Share on other sites More sharing options...
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