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ErrorLib — Industrial Fault Code Library

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0x4020

Press Unexpectedly Stopped After Starting

Beckhoff · TwinSAFE Logic FB

What does 0x4020 mean?

The PressStarted input was TRUE, indicating a commanded motion, but the position subsequently stopped ('Stopped' changed to TRUE) after having moved. This suggests an unexpected halt during a commanded press operation, which could be due to an obstruction, overload, or sensor fault, potentially damaging equipment or causing an unsafe state.

Common Causes

  • Press stopped unexpectedly after starting.
  • Sudden loss of power to the drive.
  • Overload trip during initial movement.
  • Emergency stop activated unintentionally.
  • Control system error causing premature shutdown.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Investigate the mechanical system for any sudden jams, obstructions, or excessive load that might cause an unexpected stop.

  2. 2

    Monitor motor current and drive status for overload conditions or protection trips.

  3. 3

    Check the position sensor for intermittent readings or damage that could falsely indicate a stop.

  4. 4

    Review the process logic for any conditions that might prematurely set the 'Stopped' flag to TRUE during an active PressStarted command.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

0x401FPress Not Moving After Start Command0x4021Insufficient Press Movement0x4024Position Moving During WAIT-FOR-RESET
Source: Beckhoff TwinSAFE Logic FB
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