LogrobotLM

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KUKA Error 2109 — BLOCK END MISSING

Displayed as KSS02109 on KRC4 / KRC5 controllers

KUKA 2109 (“BLOCK END MISSING”): A part of the program has not been terminated with the word “END”. First check: Modify the program.

Updated 2026-09-09 · LogrobotLM reference

Cause

A part of the program has not been terminated with the word “END”.

Effect

The program is not executable.

Troubleshooting

Modify the program. Example: DEF Up() ... END

Related codes

2108TOKEN ERROR IN THE I-CODE2110INCORRECT END OF CONTROL STRUCTURE2111INCORRECT END OF SUBPROGRAM/FUNCTION2106LINE MUST NOT BE DESTROYED

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 →