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ErrorLib — Industrial Fault Code Library

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F40002

Fault at DRIVE-CLiQ Socket X102

Siemens · DAsl Diagnostics and Alarms

What does F40002 mean?

A fault has been detected at the drive object connected to the DRIVE-CLiQ socket X102. The fault value (r0949) indicates the first fault that occurred for this specific drive object. This signifies an issue with the communication or the connected component on this particular DRIVE-CLiQ interface, which can lead to system malfunction or halt operations.

Common Causes

  • DRIVE-CLiQ cable connected to socket X102 is loose, damaged, or completely disconnected, interrupting communication.
  • The DRIVE-CLiQ component connected to X102 (e.g., Motor Module, Sensor Module, Encoder) has an internal hardware fault.
  • Faulty DRIVE-CLiQ interface circuitry on the Control Unit side specifically for socket X102.
  • Incorrect or incompatible component connected to DRIVE-CLiQ socket X102 (e.g., wrong module type or firmware mismatch).
  • Electromagnetic interference (EMI) severely disrupting DRIVE-CLiQ communication on that specific link.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Read the fault value in register r0949 associated with F40002; this will often point to the specific fault of the connected DRIVE-CLiQ device.

  2. 2

    Power off the drive, then inspect and firmly re-seat the DRIVE-CLiQ cable at both the Control Unit's X102 socket and the connected drive object's (e.g., Motor Module) DRIVE-CLiQ port.

  3. 3

    Check the DRIVE-CLiQ cable for physical damage (e.g., kinks, cuts, crushed sections) along its entire length. Replace with a known good, factory-approved DRIVE-CLiQ cable if any damage is found.

  4. 4

    Swap the DRIVE-CLiQ cable from X102 with a known good cable from another functional DRIVE-CLiQ port (if available) to rule out cable failure.

  5. 5

    If the cable is verified good, swap the connected DRIVE-CLiQ component (e.g., Motor Module, Sensor Module) with a known good unit to isolate the faulty component.

Browse all codes in this manual (31)
Verified technical data. Last updated: April 2026

Related Faults

201673SI Motion: Sensor Module software/hardware incompatible201680SI Motion CU: Checksum error safety monitoring functions206207Infeed: Line currents not symmetrical
Source: Siemens DAsl Diagnostics and Alarms
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