What the SRVO-202 alarm means

The emergency stop button on the teach pendant is pressed or its circuit is abnormal. This is one of the most common faults in our repair logs for the FANUC R-30iA / R-30iB / R-30iB Plus platform, and the first inspection typically locates the cause.

Most common causes

  • TP button pressed
  • TP cable damage (very common - cable is a wear item)
  • TP E-stop contact failure
Field note: Field experience says the first cause is the most likely — verify it before moving on to the rest.

Step-by-step field fix

  1. Release the TP E-stop and reset
  2. Inspect the TP cable for cuts, crushed sections, bent connector pins
  3. Swap with a known-good TP to isolate pendant vs. cable vs. controller
Safety first: For FANUC srvo-202, this alarm is the safety circuit itself: jumpering a door switch or forcing a contactor removes the protection entirely - no protective action when something happens, and no defensible account of responsibility. What you can check yourself first is Release the TP E-stop and reset; the e-stop chain and safety circuit handling is not a DIY job.

How we diagnose safety-chain faults on site

FANUC srvo-202 belongs to the safety chain & e-stop family. On FANUC srvo-202 the failing stage is Dual Check Safety (e-stop board plus dual-channel safety circuit) on the R-30iB Plus / R-30iB Mate Plus / R-30iA - continuity of one series loop: e-stop buttons, door switches, light curtains, safety relays and the enabling device. We start reading FANUC srvo-202 at the iPendant ALARM screen (SRVO / MOTN / SYST / INTF prefixes) together with the amplifier's 7-segment status code.

The chain involved in FANUC srvo-202 runs: e-stop / door / curtain -> safety relay (dual channel) -> controller safety input -> motor-off and brake apply.

On FANUC srvo-202 (field clue usually TP button pressed) we have one hard rule: On this family we have a hard rule: no bypassing the safety loop, no forcing contactors closed, ever. Some sites jumper the door switch to keep running - that removes the entire protection function, and when something happens there is no protective action and no defensible account of responsibility. We have seen a crush injury caused by exactly that jumper, so we would rather wait for parts than do it. If a customer has already jumpered it, we restore the circuit first and then diagnose the real fault.

Field notes on this page cover FANUC srvo-202 (TP E-Stop); written by the Henghuan repair team, updated 2026-10-01.

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Related Safety Chain & E-Stop alarms

SRVO-105 — Door Open or E.Stop SRVO-201 — Panel E-Stop SRVO-204 — External E-Stop (SVEMG Abnormal) SRVO-230 — Chain 1 (+24V) Abnormal SRVO-231 — Chain 2 (0V) Abnormal SRVO-232 — NTED Input Abnormal
Same family: this code belongs to the Safety chain & e-stop alarms family - the page collects all Safety chain & e-stop-family codes we have handled, with the common inspection order and spares.
Other brands: see our KUKA, ABB, Yaskawa and Universal Robots field-fix libraries — or the full 10-brand hub.

Frequently asked questions

QWhat does the FANUC srvo-202 alarm mean?

The emergency stop button on the teach pendant is pressed or its circuit is abnormal. This is one of the most common faults in our repair logs for the FANUC R-30iA / R-30iB / R-30iB Plus platform, and the first inspection typically locates the cause. FANUC srvo-202 sits in the safety chain & e-stop family; on our work orders the highest-frequency trigger for this code is "TP button pressed".

QCan I clear a FANUC srvo-202 alarm myself?

Whether FANUC srvo-202 clears on its own depends on the outcome of "Release the TP E-stop and reset". Finish the flow with "Swap with a known-good TP to isolate pendant vs. cable vs. controller" to confirm FANUC srvo-202 - do not skip it. If that step is clean, the second most frequent cause on FANUC srvo-202 is "TP cable damage (very common - cable is a wear item)". Two attempts and still there means stop: FANUC srvo-202 involves the e-stop chain and safety circuit, and running FANUC srvo-202 on can turn a repairable fault into a replacement.

QA safety-chain fault like FANUC srvo-202 stops the line - how fast can you be here?

The commonest causes we see on FANUC srvo-202 are "TP button pressed, TP cable damage (very common - cable is a wear item), TP E-stop contact failure", so we stock the van against those. For FANUC srvo-202 specifically, we stock along the loop: safety relays, common door switches, e-stop buttons, light-curtain pairs and terminal blocks. For FANUC srvo-202, a safety-chain fault stops the whole line, so we rank it top priority and pre-triage by phone: door switch, e-stop or relay. Before we roll, tell us what FANUC srvo-202 shows on the iPendant ALARM screen (SRVO / MOTN / SYST / INTF prefixes) together with the amplifier's 7-segment status code and what the machine was doing - phone or video triage is free.

This page on FANUC srvo-202 is based on the field experience of the Henghuan Robotics repair team. Alarm explanations are our own summary for troubleshooting reference and may differ across controller and software versions — if unsure, verify against FANUC documentation or reach out to us. Henghuan is an independent service provider with no affiliation or endorsement by FANUC.