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ErrorLib — Industrial Fault Code Library

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F4A5

SoE Communication Parameter Error

Beckhoff · AX5000 Servo Drive

What does F4A5 mean?

This error indicates a problem with the Service over EtherCAT (SoE) communication parameters configured for the drive. The specific parameter causing the fault is identified in S-0-0021, which can be viewed in the TCDriveManager Diagnostics window. A common root cause is an incorrect setting in parameter P-0-0150, particularly an improper value for "Signal periods per rotation." This error often triggers other consequential errors like F152 and FA01, preventing the drive from operating correctly.

Common Causes

  • Mismatch in EtherCAT network configuration between the master controller and the drive's SoE parameters (e.g., P-0-0010, P-0-0011).
  • An invalid value or data type written to a drive parameter via SoE by the master controller.
  • SoE communication timeout due to excessive network latency or an overloaded EtherCAT master.
  • Corruption of the drive's internal non-volatile memory storing SoE parameters.
  • Firmware version incompatibility between the EtherCAT master and the drive, affecting SoE object dictionary interpretation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Read parameter S-0-0021 to identify the specific SoE parameter (index and subindex) causing the error.

  2. 2

    Compare the identified parameter's value and data type in the drive's configuration (via service tool) with the value sent by the EtherCAT master.

  3. 3

    Verify the EtherCAT network topology and cabling for proper connection and shielding. Check LED indicators on the drive's EtherCAT ports (e.g., LINK/ACT).

  4. 4

    Perform a drive factory reset (P-0-0000=1) and reload the drive configuration from a known good backup file.

  5. 5

    Update drive firmware and EtherCAT master firmware to compatible versions as per manufacturer's guidelines.

Browse all codes in this manual (7)
Verified technical data. Last updated: April 2026

Related Faults

F107Status of the axis: current controller not readyF152Channel ErrorsF2A0Commutation error
Source: Beckhoff AX5000 Servo Drive
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