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KUKA Error 2131 — EXPRESSION MISSING AFTER THE RETURN STATEMENT

Displayed as KSS02131 on KRC4 / KRC5 controllers

KUKA 2131 (“EXPRESSION MISSING AFTER THE RETURN STATEMENT”): In a function, a return value is expected after the RETURN statement. First check: Modify the program.

Updated 2026-09-09 · LogrobotLM reference

Cause

In a function, a return value is expected after the RETURN statement. Example: DEFFCT INT Otto() INT a ... RETURN ENDFCT

Effect

The program is not executable.

Troubleshooting

Modify the program. Example: DEFFCT INT Otto() INT a ... RETURN(a) ENDFCT

Related codes

2130EXPRESSION AFTER RETURN NOT ALLOWED2132INTERFACES NOT ALLOWED2129FORMAL PARAMETER NOT DEFINED2133TYPE MUST BE 'POS', 'FRAME' OR 'AXIS'

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 →