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KUKA Error 2251 — EXPRESSION DIFFERENT FROM POS, FRAME

Displayed as KSS02251 on KRC4 / KRC5 controllers

KUKA 2251 (“EXPRESSION DIFFERENT FROM POS, FRAME”): An expression of data type “POS” or “FRAME” is expected. First check: Modify the program accordingly.

Updated 2026-09-09 · LogrobotLM reference

Cause

An expression of data type “POS” or “FRAME” is expected.

Effect

The program cannot be executed.

Troubleshooting

Modify the program accordingly.

Related codes

2250EXPRESSION DIFFERENT FROM BOOL2252EXPRESSION DIFFERENT FROM POS, FRAME, AXIS2249EXPRESSION DIFFERENT FROM INT2253VARIABLE OR ARRAY EXPECTED

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 →