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KUKA Error 1121 — DATA TRANSMISSION

Error

Displayed as KSS01121 on KRC4 / KRC5 controllers

KUKA 1121 (“DATA TRANSMISSION”): The SBC stops data transmission because of a fault. First check: Eliminate the fault in the SBC program.

Updated 2026-09-09 · LogrobotLM reference

Cause

The SBC stops data transmission because of a fault.

Effect

Stop via braking ramp. SBC interface interrupted.

Troubleshooting

Eliminate the fault in the SBC program.

Related codes

1120INCOMPLETE COMMAND1122ANALOG OUTPUTS -- DELAY REDUCTION1119WRONG TEPRO DATA TYPE1118CYCLICAL TEPRO DATA NOT RELEASED

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 →