Water temperature control with micrologix 1100


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Trying to design a system that has city water temperature as low as 40 degrees F, and boiler water around 160 degrees F. into a 0-10volt mixing valve, with an output temperature of approx 74 degrees.

Using a micrologix 100 with RTD inputs for my 3 temps and an analog output for my mixing valve.

I have a Red Lion G3 HMI communicating to the 1100.
I am having trouble figuring out the scaling part on the PID instruction.