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ErrorLib — Industrial Fault Code Library

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UL

24V Logic Power Supply Fault

Phoenix Contact · AXC F 1050 Controller

What does UL mean?

This indicator, when off, shows that the 24V communications power feed-in for the logic section (ULogic) is either completely absent or its voltage level is too low. This critical condition prevents the Axioline F station from operating correctly.

Common Causes

  • Absence of 24VDC communications power supply.
  • 24VDC communications power supply voltage is below the operational threshold.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Measure the 24VDC power supply voltage at the communications power feed-in terminals of the Axioline F station.

  2. 2

    Verify the power supply unit providing the 24VDC for correct output voltage and current capacity.

  3. 3

    Inspect the power cabling from the 24VDC supply to the Axioline F station for breaks or loose connections.

Browse all codes in this manual (9)
Verified technical data. Last updated: April 2026

Related Faults

BF-CPROFINET Controller Communication ErrorBF-DPROFINET Device Communication ErrorDAxioline F Local Bus Error
Source: Phoenix Contact AXC F 1050 Controller
Open Manual (Page 26)Search more codes in this manual