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FANUC Alarm SYST-211 — Comm processor Time-out error

Error
Hardware
main board and memory
Controllers
R-30iA (this generation only)
FANUC class
SYSTEM
Hardware family
FANUC teach pendant, main board, CMOS and controller battery alarms

FANUC SYST-211 (“Comm processor Time-out error”): The communications processor did not respond within the specified time-out limit. First check: Turn off the controller and then turn it on again.

Updated 2026-10-22 · LogrobotLM reference

Description

The communications processor did not respond within the specified time-out limit.

Remedy

Turn off the controller and then turn it on again. If the alarm persists document the events that led to the error, and call your FANUC or FANUC Robotics technical representative.

Field diagnosis

The communication processor did not respond within the allotted time.

What to check

  • Switch the controller off and back on; if the code persists, document it and contact support.
  • Note: May follow a network board added while powered on.

Related codes

HOST-111WARN Cycle power to use EthernetSYST-031SYSTEM F-ROM paritySYST-208Feature NOT supportedSYST-210Process Sync Time-out errorSYST-212Need to apply to DCS paramSYST-213User power cycle

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 →