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ErrorLib — Industrial Fault Code Library

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STOP 1

Safety Stop 1

Kuka · Industrial Robots Use & Programming

What does STOP 1 mean?

A Safety STOP 1 has been triggered and monitored by the safety controller. In this stop, the non-safety-oriented part of the robot controller performs a controlled braking process. Once the manipulator reaches a standstill, the safety controller then switches off the drives and applies the brakes.

Common Causes

  • Loss of operator safety signal, such as an opened safety fence monitoring switch in AUT mode.
  • Release of an enabling switch on the KCP (when in T1 or T2 mode).
  • Activation of an external safety stop signal (e.g., from an external EMERGENCY STOP device).
  • Robot exceeding monitored velocity in T1 mode.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify all safety fence monitoring switches are closed and interlocks are engaged.

  2. 2

    Ensure the enabling switch on the KCP is held in the center position.

  3. 3

    Acknowledge any outstanding safety messages in the smartPAD message window.

  4. 4

    Re-enable robot drives through the appropriate controller interface.

Browse all codes in this manual (6)
Verified technical data. Last updated: April 2026

Related Faults

Active commands inhibitedActive Commands InhibitedGENERAL MOTION ENABLEGeneral Motion Enable LostSTOP 0Safety Stop 0
Source: Kuka Industrial Robots Use & Programming
Open Manual (Page 243)Search more codes in this manual