1MRS750915-MUM
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Machine Terminal
Technical Reference Manual, General
5.1.9.10. Calibration
The RTD/analog module is calibrated at the factory. To be able to maintain the
specified accuracy in spite of aging and varying temperature, the card also includes
special hardware to allow self-recalibration on the field. This recalibration
procedure runs continuously, even when no measurements are activated, to ensure
that the card is always optimally calibrated. If the recalibration procedure fails, the
reason is a hardware failure. In this case the card's measurement accuracy is no
longer obtained, and the invalidity attributes of all inputs are set to TRUE. However,
the card continues updating the measured input values, and if the invalidity attributes
are not used in the machine terminal configuration, the situation could go unnoticed.
Should the recalibration succeed later, the invalidity attributes return to normal
operation.
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