C
I am using the PID2 instruction in a Compact PLC with a 984-E275 CPU.
I am specifically interested in anyone's experience with how to use the tracking function when switching the loop from auto to manual or vice-versa.
The problem I have is that when I put the loop into auto by turning on the “top” input of the PID instruction, then depending on the setpoint and the PV the output (CV) “jumps” a large amount before it starts to control normally.
The process I am controlling cannot handle this large change in the output.
I know that the “middle” input may have something to do with this but the documentation in the manual I have is not very helpful in understanding how to use this.
Any help on this matter would be appreciated.
I am specifically interested in anyone's experience with how to use the tracking function when switching the loop from auto to manual or vice-versa.
The problem I have is that when I put the loop into auto by turning on the “top” input of the PID instruction, then depending on the setpoint and the PV the output (CV) “jumps” a large amount before it starts to control normally.
The process I am controlling cannot handle this large change in the output.
I know that the “middle” input may have something to do with this but the documentation in the manual I have is not very helpful in understanding how to use this.
Any help on this matter would be appreciated.