SNK
Member
I am attempting to control a PID system for a Vacuum Chamber, using an analog input for the scaled input of 6120 to 31200. I have only a digital output signal to control the bleed off valve, which I am attempting to use to keep the setpoint. ( I cannot see turning a pump on and off through the process, so I will leave it running, and turn the valve on and off, much like a heater relay in a PID system)
I cannot find a programming example with PID for ML1200 that uses a discrete output to control the PID system. This is my first PID programming experience, and I cannot seem to find anything in AB that is using this scenario. I also see that the pre-scaled integer needs to be in the range of 0-16383, which I am out of so far.
I know this sounds simple, but all of the programming examples are using an analog output for the closed loop system.
It would seem that this should be a very easy implementation, but I cannot seem to get anywhere with it. All the examples are for SLC's or PLC5's, and Controllogix systems.
Can someone lead me in the right direction?
I cannot find a programming example with PID for ML1200 that uses a discrete output to control the PID system. This is my first PID programming experience, and I cannot seem to find anything in AB that is using this scenario. I also see that the pre-scaled integer needs to be in the range of 0-16383, which I am out of so far.
I know this sounds simple, but all of the programming examples are using an analog output for the closed loop system.
It would seem that this should be a very easy implementation, but I cannot seem to get anywhere with it. All the examples are for SLC's or PLC5's, and Controllogix systems.
Can someone lead me in the right direction?