FANUC Alarm PNT1-099 — PC serial interface fault
FANUC PNT1-099 (“PC serial interface fault”): The PLC interface serial link has failed. First check: Check the LED status on PLC interface board.
Updated 2026-09-17 · LogrobotLM reference
Description
The PLC interface serial link has failed.
Remedy
Check the LED status on PLC interface board. Refer to Remote I/O interface for an Allen-Bradley PLC or Genius Network Interface for GE FANUC manual for more information.
Related codes
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 →