Hi guys,
I know this is a Mervis section, but if PID control is what you are after, consider switching to REXYGEN. Works like charm.

Codesys clearly states that the version for Raspberry Pi can be used for testing and training only. Thus by using it in your automation projects you would be breaking the terms of use. This is not the case of Mervis or REX. So I guess you are comparing apples and oranges…