LogrobotLM

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KUKA Error 2321 — PREDEFINED SIGNAL MUST NOT BE MODIFIED

Displayed as KSS02321 on KRC4 / KRC5 controllers

KUKA 2321 (“PREDEFINED SIGNAL MUST NOT BE MODIFIED”): The program cannot be executed. First check: Modify the program accordingly.

Updated 2026-09-09 · LogrobotLM reference

Effect

The program cannot be executed.

Troubleshooting

Modify the program accordingly.

Related codes

2320SIGNAL NAME MUST NOT BE MODIFIED2322SIGNAL TYPES ARE DIFFERENT2323SIGNAL TYPE MUST NOT BE MODIFIED2318PARAMETERS MUST BE DECLARED IN THE MODULE

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 →