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KUKA Error 257 — ERROR IN USER DATA

Error

Displayed as KSS00257 on KRC4 / KRC5 controllers

KUKA 257 (“ERROR IN USER DATA”): The user data loader has detected that a variable was initialized with an incorrect value: -- The maximum limit was exceeded. First check: Correct the value assignment of the displayed variable.

Updated 2026-09-09 · LogrobotLM reference

Cause

The user data loader has detected that a variable was initialized with an incorrect value: -- The maximum limit was exceeded. -- No logical consistency of the data.

Effect

Path-maintaining stop. All active commands inhibited. No RC--Ready.

Troubleshooting

Correct the value assignment of the displayed variable.

Related codes

258ERROR IN OPTION DATA260LOADING OF USER DATA ABORTED261LOADING OF OPTION DATA ABORTED263ERROR IN CORRECTION DATA

Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →