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ErrorLib — Industrial Fault Code Library

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F3131

Error when checking acknowledgment signal

Bosch Rexroth · IndraDrive MPx02

What does F3131 mean?

This non-fatal safety error occurs on the IndraDrive MPx02 when an expected acknowledgment signal for a safety function is either missing, incorrect, or not received within the specified timeframe. This prevents the safety function from proceeding or resetting, as the system cannot confirm its proper execution or reset state.

Common Causes

  • Acknowledgment push button or external safety device malfunction.
  • Wiring issue in the acknowledgment circuit (e.g., open circuit, short circuit).
  • Incorrect parameterization of the acknowledgment monitoring time or logic.
  • Communication fault preventing the acknowledgment signal from reaching the IndraDrive MPx02.
  • Operator failed to provide the acknowledgment signal after a safety event.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify that the acknowledgment push button or external safety device is functioning correctly and is not stuck or damaged.

  2. 2

    Inspect the wiring of the acknowledgment signal path to the IndraDrive MPx02 for loose connections, damage, or improper termination.

  3. 3

    Measure the voltage at the acknowledgment input terminal on the IndraDrive MPx02 to confirm signal presence upon activation.

  4. 4

    Check safety parameters in the IndraDrive MPx02 related to acknowledgment monitoring, specifically timing and logic settings.

  5. 5

    Ensure the operator is following the correct procedure for acknowledging safety faults or system states.

Browse all codes in this manual (99)
Verified technical data. Last updated: April 2026

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Source: Bosch Rexroth IndraDrive MPx02
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