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KUKA Error 1440 — WRONG MAILBOX IDENTIFICATION

Error

Displayed as KSS01440 on KRC4 / KRC5 controllers

KUKA 1440 (“WRONG MAILBOX IDENTIFICATION”): In the C function "MBX_REC", an incorrect "MBX_ID" was specified. First check: Modify the program accordingly.

Updated 2026-09-09 · LogrobotLM reference

Cause

In the C function "MBX_REC", an incorrect "MBX_ID" was specified.

Effect

Stop via braking ramp. All active commands are inhibited.

Troubleshooting

Modify the program accordingly. Acknowledge the message.

Related codes

1438ARCHIVE DEVICE NOT READY: ...1437REPOSITIONING!1434TARGET POINT NOT REACHED1446VALUE ASSIGNMENT NOT ALLOWED

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 →