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Old July 19th, 2005, 09:33 AM   #1

harshad is offline
Join Date: Jul 2005
Posts: 2
Temp controller problem

I have GE fanuc Versa max PLC.
But in Versamax plc have only Analog PID controller & my heater is a digital output. so how I can integrate with PID to digital output.
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Old July 19th, 2005, 09:39 AM   #2
Tom Jenkins
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The basic technique is to "convert" the output of the PID loop to a 0-100% signal. Then use this to change the pre-set for a timer controlling your heater. 100% will be heater on continuously, 0% would be heater off continuously, and 50% would be on for 10 seconds, off for 10 seconds for example. Obviously you would need to select the time period as appropriate for your application.
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