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In Logix 5000 the abilties of the function block enhanced PID does not contain a setpoint filter or ramp like I have seen in most DCS systems. I have looked at other blocks like ramp/soak and it is still not what I need.
I need to apply a rate of change to the setpoint to prevent operator from making drastic setpoint changes.
Applying a rate limiter to the output is not the answer.
Other than creating a second PIDE with locked in cascade with a RSP from another PIDE with unity gain settings and a rate limiter in between, I don't know how else to do this. Any ideas for a clean and simple solution?
thanks in advance.
I need to apply a rate of change to the setpoint to prevent operator from making drastic setpoint changes.
Applying a rate limiter to the output is not the answer.
Other than creating a second PIDE with locked in cascade with a RSP from another PIDE with unity gain settings and a rate limiter in between, I don't know how else to do this. Any ideas for a clean and simple solution?
thanks in advance.