LogrobotLM

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FANUC Alarm COPT-021 — WARN Send_PC event parm … error

Manufacturer wording — WARN Send_PC event parm %s error
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC COPT-021 (“WARN Send_PC event parm … error”): A Send to PC MACRO was called with a parameter that is illegal. First check: Check the MACRO call in the TP program.

Updated 2026-09-17 · LogrobotLM reference

Description

A Send to PC MACRO was called with a parameter that is illegal. The parameter is uninitialized or the wrong data type.

Remedy

Check the MACRO call in the TP program.

Related codes

COPT-011WARN Send_PC Buffer too big for packetCOPT-020WARN Send_PC builtin failedCOPT-022WARN Still waiting for …COPT-023WARN Abort wait for …

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 →