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dear sir
i have joined the BMS program for heater in my company, which created by Hima H4/1q i contact as OLT and i could do forces, but i couldn't change the PT of the timers online as the project is read only

Any suggestions?

Hi.

The most probable answer is that the timer PT values are constants which can only be changed offline, recompiled, and downloaded. This is common for many critical timers in BMSes such as purge time, light off time, etc. It prevents accidental changes, etc. For total flexibility change them to variables, but beware the possibilities of erroneous changes described above.

I second Nick, if you need to make them variable at least have code that checks to make sure the set-point is within a reasonable range.

Roy