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KUKA Error 1544 — DIGITAL INPUT ALREADY IN USE

Error

Displayed as KSS01544 on KRC4 / KRC5 controllers

KUKA 1544 (“DIGITAL INPUT ALREADY IN USE”): The program activates a cyclical digital input for the second time. First check: First cancel the cyclical digital input.

Updated 2026-09-09 · LogrobotLM reference

Cause

The program activates a cyclical digital input for the second time.

Effect

Stop via braking ramp. All active commands are inhibited.

Troubleshooting

First cancel the cyclical digital input.

Related codes

1543ALL CYCLICAL ANALOG INPUTS IN USE1545ALL PULSE OUTPUTS IN USE1546WRONG PULSE DURATION1541INCORRECT MACHINE DATA

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 →