Measurement Underflow at AI581-S I/O Module

What does Measurement underflow at the I/O module mean?

A diagnosis message with severity level 3 reports "Measurement underflow at the I/O module" for an AI581-S input channel, even when an overcurrent condition was actually observed. The internal detection mechanism for AI581-S electronics is not always able to differentiate between over- and undercurrent because overcurrent can be followed by undercurrent effects.