User Documentation

Table Of Contents
9 Diagnosticsandtroubleshooting | LED indicators and troubleshooting
56 2547720000/03/09.2019Manual Communication module UR20-4COM-IO-LINK
9.3 LED indicators and troubleshooting
LED Status Recommended action
Status LED Red: Error in the supply voltage at input current path
Communication error on the system bus
Configuration error IO-Link
There is a new diagnostic message
Check the supply voltage
Check that the module has been snapped into place
properly
Check the configuration
Channel LED 1.1...4.1 Yellow: Status COM 1...COM4
1.2...4.2 Red: Fehler IO-Link port1...IO-Link port4 Check the wiring
Check the configuration
1.4...4.4 Yellow: Status DI1...DI4