Yikes! I can see where someone like me might be confused by that and do the wrong thing. (changing the OUTPUT but thinking I was changing the SETPOINT).
The algorithms I've seen have an OUTPUT that is read-only when the loop is AUTO and read-write when the loop is MANUAL.
- Brian
Yes I kind of regret even bring up the subject of 'setpoint tracking' as I don't recall if it is even implemented in this existing library. It is however a very common mode of operation now a days with micro based PID controllers. In the old days of standalone analog PID controllers there was a separate manual output adjustment knob and a separate setpoint adjustment knob. It was up to the operator when switching from manual to automatic to first 'match up' the setpoint value to the existing output value so that the output would not spike when first placed back into automatic mode. Setpoint tracking did this step automatically and became a common operating feature.
Lefty