Ext I/O comm loss

What does A799 mean?

The drive generates a warning when communication to an I/O extension module fails. This indicates a disruption in the control signal flow between the drive and its peripheral I/O, potentially affecting system operation and control accuracy.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Confirm that the communication parameters and addressing settings are correctly configured in both the drive and the I/O module.

2. 4

   Inspect the I/O module for any diagnostic LEDs that may indicate its status or internal errors.