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ErrorLib — Industrial Fault Code Library

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4504

Following error monitoring (position) not allowed

Beckhoff · TwinCAT 2 NC

What does 4504 mean?

The value for the activation of the following error monitoring (position) is not allowed, as the value range is limited to [0, 1]. This parameter enables or disables the system's ability to detect deviations between commanded and actual position. An invalid setting means critical safety monitoring might be disabled or misconfigured.

Common Causes

  • The parameter for activating following error monitoring (e.g., P6-05, Position Error Monitor) is set to an invalid value other than '0' (disabled) or '1' (enabled).
  • Attempt to enter a boolean 'TRUE'/'FALSE' or other non-numeric input into a parameter expecting '0' or '1'.
  • Configuration tool or HMI error that allows or defaults to an out-of-range value for this binary parameter.
  • Corrupted parameter block within the drive or controller's non-volatile memory.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Access the following error monitoring parameter (e.g., P6-05) and explicitly set its value to either '0' (disabled) or '1' (enabled).

  2. 2

    2. Ensure any automation logic or HMI inputs interfacing with this parameter are configured to send only '0' or '1' as valid states.

  3. 3

    3. If experiencing persistent issues, try resetting the parameter to its factory default value (if allowed) and then re-entering '0' or '1'.

  4. 4

    4. Perform a complete parameter download from the configuration software to the drive to overwrite any corrupted values.

  5. 5

    5. Review the system's safety requirements and tuning guide to determine whether following error monitoring (P6-05) should be enabled (1) or disabled (0).

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Verified technical data. Last updated: April 2026

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4000Internal error4001Memory error4002Nc retain data error (persistent data)
Source: Beckhoff TwinCAT 2 NC
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