Measurement Underflow

What does 263 mean?

This error indicates that the measured signal value on an analog input channel is below the minimum range or threshold the I/O module expects. Possible causes include a disconnected sensor, a sensor providing too low a signal, or a problem with the sensor's power supply, resulting in no meaningful input.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Inspect the channel wiring for open circuits, loose connections, or damaged cables.