Hello, I've got an old PLC which does not come with any PID loop capability. Trying to control a small heater (nothing critical), but in the absence of an PID controller in the CPU I must write a "pseudo", time-controlled PID. Does anyone have a sample code to accomplish this? What I have in mind is a time/percentage controlled feature, where as the temperature gets closer to the set point the heater turns on less time, etc. Thanks.