LogrobotLM

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FANUC Alarm SYST-231 — RCRON: Action failed

FANUC SYST-231 (“RCRON: Action failed”): RCRON command could not be executed. First check: Check md:crontab.dg for errors.

Updated 2026-09-17 · LogrobotLM reference

Description

RCRON command could not be executed. This is caused by either an incorrect crontab file or by the corresponding module not being loaded on the controller.

Remedy

Check md:crontab.dg for errors.

Related codes

SYST-223Image backup failed(0x…)SYST-230RCRON: Action successfulSYST-232RCRON: Tick missedSYST-233RCRON: No response from MAIN

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 →