Measurement underflow at the I/O module

What does 263 mean?

The input measurement on a safety I/O channel has fallen below its minimum detectable range. This can be due to an under-range signal from the sensor, incorrect wiring, or an issue with the sensor's power supply. For AI581-S input channels, the internal detection mechanism might not differentiate between over- and undercurrent effectively, as overcurrent can be followed by undercurrent effects in the electronics. This is a severity 3 error.

1. 1

   Check the channel wiring for correct connections and ensure the sensor output range matches the I/O module input specifications.

2. 2

   Verify the power supply to the sensor connected to the channel, ensuring it is within the specified operating voltage.