What is the reason for the error "underflow" of the PCDx.W745?

FAQ #100499

In case a thermocouple sensor is connected with the wrong polarity, the FBox (or the FB) will indicate this with the error "underrange" or "underflow".

Note
The problem most likely occurs in higher temperature ranges as the voltage measured at room temperature is nearly =0. Therefore it is possible that the problem doesn't occur at room temperature (also the temperature measured is not accurate in this case, no error message is indicated).

This FAQ applies to the PCD2.W745 as well as for the PCD3.W745.

What is the reason for the error "underflow" of the PCDx.W745?

FAQ #100499

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