18-128

Guard Motion safety function fault

Allen-Bradley · Logix 5000

What does 18-128 mean?

A fault specific to the Guard Motion safety function has occurred. This fault is only applicable when using a drive with Guard Safety functionality and indicates a safety integrity issue.

Common Causes

  • A fault specific to the Guard Motion safety function has occurred
  • Fault is applicable only when use a drive with Guard Safety functionality

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    See the Guard Motion attributes and Guard Status bits to determine the cause of the fault to determine corrective action.

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Verified technical data. Last updated: March 2026

Related Faults

Allen-Bradley Error 18-128: Guard Motion safety function fault — Troubleshooting Guide | ErrorLib