FANUC Alarm FRCE-172 — F/S communication error (F:…)
Manufacturer wording — F/S communication error (F:%d^1)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC FRCE-172 (“F/S communication error (F:…)”): Communication failed between the sensor head and the sensor board. First check: 1. Move the robot to a safe pose. Likely part: Sensor board (Sensor interface board) +1 more.
Updated 2026-09-17 · LogrobotLM reference
Description
Communication failed between the sensor head and the sensor board.
Remedy
1. Move the robot to a safe pose. 2. Turn the controller OFF, then ON again. If this alarm occurs again, go to the next step. 3. Remove any sources of noise in the sensor system. Turn the controller OFF, then ON again. If this alarm occurs again, go to the next step. 4. Make sure that the shield lines of the cables are connected to the frame ground. Make sure that the peeled part of the cable in the cabinet is properly connected to the earth plate. If this alarm occurs again, go to the next step. 5. Check the sensor cable connectivity. Check also for cut lines. If there is nothing wrong, go to the next step. 6. Replace the sensor board. If this alarm occurs again, go to the next step. 7. Replace the sensor head.
Part to check / replace
FANUC FRCE-172 points to the hardware below — start here before ordering.
Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.
Related codes
Same hardware involved
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 →