PID20 + MAX!

[hanszorn]

Still a newbie, but have a few things working already.
The next thing I like to get done is PID20 replace the internal controller of a MAX heater controller. I understand from the Wiki that PID20 will then control the Max through the MaxValveSetting, which makes sense as the ValvePosition is read-only.
But now I wonder: how do I prevent the Max itself from interfering in this process? I cannot find anything on this in the Wiki or elsewhere...

Vielleicht geht es hier doch besser auf deutsch. Ich möchte in meine Max! Anlage die eigentliche Regelung auf ein PID20 umsetzen. Ich habe das Wiki darüber gelesen, aber verstehe noch nicht wie man dabei die eigene Regelung der Max ausser Betrieb stellen soll, den man will doch nicht gleichzeitig  2 Regler haben. Irgendjemand?

[John]

This is pretty easy.

Set the highest possible setpoint for MAX, which the internal PID never can satisfy.

In this case the the logical valve position will be always 100%.

At this point your external PID can take over control for the physical ValvePosition by writing MaxValveSetting.

John