AI830 on 800xA/AC800M - Temperature Offset
we have a problem with the right indication of a Pt100 temperatur signal, which is acquired by AI830 module.
S800/AI830 (TU810) module is connected via Profibus to the AC800M controller.
External wiring is in accordance with data sheet, was checked and is ok.
Unfortunately we get a temperature offset of 30..35 °C.
Configuration is attached.Any ideas, what could be wrong? Regards Holger
Voted best answer
I think the reason is the difference between channel signal range (-200...850) and the scaling (-100...600).
If that is Pt100 measurement, both should be equal: first select channel signal and then write the same scaling for the variable. It dorsn't matter what is written in your sensor - select channel range closer to it for better accuracy.