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MOD Indicator Flashing Red and Green

UNID Not Commissioned (Safety I/O)

Allen-Bradley · Compact 5000 Digital I/O Modules

What does MOD Indicator Flashing Red and Green mean?

For Compact 5000 safety I/O modules only, a flashing red and green Module Status Indicator (MOD) signifies that the Unique Network ID (UNID) has not been commissioned in the module. This is a critical prerequisite for safety module operation.

Common Causes

  • The Unique Network ID (UNID), which provides a unique identifier for the safety module on the network, has not been properly commissioned during its initial setup or module replacement.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Commission the UNID in the module using the Studio 5000 Logix Designer software, ensuring the correct UNID is assigned.

Browse all codes in this manual (38)
Verified technical data. Last updated: April 2026

Related Faults

CIPSyncTimeoutCIP Sync Master TimeoutConnectionFaultedOwner-Controller Connection FaultCriticalTemperatureModule Critical Temperature
Source: Allen-Bradley Compact 5000 Digital I/O Modules
Open Manual (Page 114)Search more codes in this manual