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FANUC Alarm MOTN-187 — Protect of ACK BF to be read

FANUC MOTN-187 (“Protect of ACK BF to be read”): Failed to read ACK from slave. First check: Confirm communication status and retry the operation.

Updated 2026-09-17 · LogrobotLM reference

Description

Failed to read ACK from slave.

Remedy

Confirm communication status and retry the operation.

Related codes

MOTN-185Protect of ACK BF to be sentMOTN-186Protect of BCST BF to be sentMOTN-188Protect of BCST BF to be readMOTN-189Slave motion remained

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 →