What the SRVO-007 alarm means

The external emergency stop circuit is open on legacy controllers. We fix this FANUC R-30iA / R-30iB / R-30iB Plus fault almost daily, and one round of on-site checks usually confirms what is going on.

Most common causes

  • External E-stop button pressed
  • Safety PLC/relay output open
  • Aged wiring in the external E-stop loop
Field note: We have tallied real cases: the first cause tops the list, so start your diagnosis there.

Step-by-step field fix

  1. Reset external E-stops
  2. Check the safety relay/PLC outputs driving the loop
  3. Inspect aged wiring and terminals on used machines
Safety first: For FANUC srvo-007, 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. The self-serviceable action is Reset external E-stops; anything past that falls under the e-stop chain and safety circuit and needs a certified engineer.

How we diagnose safety-chain faults on site

FANUC srvo-007 belongs to the safety chain & e-stop family. On FANUC srvo-007 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-007 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-007 runs: e-stop / door / curtain -> safety relay (dual channel) -> controller safety input -> motor-off and brake apply.

On FANUC srvo-007 the field usually reports External E-stop button pressed, but the check that matters is not continuity: The point of a safety loop is not whether it conducts but whether both channels conduct together. The relay compares channels; if one opens tens of milliseconds early it latches as a channel fault. The commonest causes are plain: oxidised door-switch contacts raising contact resistance, or one loose terminal. We measure segment by segment - pendant e-stop, panel e-stop, external e-stop, safety door - and lock onto whichever segment reads differently on the two channels.

Field notes on this page cover FANUC srvo-007 (External Emergency Stop (Legacy)); written by the Henghuan repair team, updated 2026-10-01.

No luck? Hand it to the team that fixes this daily

Tell us these three: alarm code, robot model, and the operating condition at the alarm. FANUC srvo-007 FANUC srvo-007 is a diagnosis our engineers do daily, and phone/video remote diagnosis is free.

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Related Safety Chain & E-Stop alarms

SRVO-105 — Door Open or E.Stop SRVO-201 — Panel E-Stop SRVO-202 — TP E-Stop SRVO-204 — External E-Stop (SVEMG Abnormal) SRVO-230 — Chain 1 (+24V) Abnormal SRVO-231 — Chain 2 (0V) 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-007 alarm mean?

The external emergency stop circuit is open on legacy controllers. We fix this FANUC R-30iA / R-30iB / R-30iB Plus fault almost daily, and one round of on-site checks usually confirms what is going on. FANUC srvo-007 sits in the safety chain & e-stop family; on our work orders the highest-frequency trigger for this code is "External E-stop button pressed".

QCan I clear a FANUC srvo-007 alarm myself?

Whether FANUC srvo-007 clears on its own depends on the outcome of "Reset external E-stops". Finish the flow with "Inspect aged wiring and terminals on used machines" to confirm FANUC srvo-007 - do not skip it. If that step is clean, the second most frequent cause on FANUC srvo-007 is "Safety PLC/relay output open". When FANUC srvo-007 keeps coming back it is not a one-off trigger - especially if Inspect aged wiring and terminals on used machines is where you get stuck. Do not keep producing through FANUC srvo-007.

QA safety-chain fault like FANUC srvo-007 stops the line - how fast can you be here?

The commonest causes we see on FANUC srvo-007 are "External E-stop button pressed, Safety PLC/relay output open, Aged wiring in the external E-stop loop", so we stock the van against those. For FANUC srvo-007 specifically, we stock along the loop: safety relays, common door switches, e-stop buttons, light-curtain pairs and terminal blocks. For FANUC srvo-007, 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-007 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-007 was written by the Henghuan Robotics repair team from field service experience. Alarm descriptions are our own summary for troubleshooting reference and may vary by controller and software version — when in doubt, check your FANUC documentation or contact us. Henghuan is an independent service provider, not affiliated with or endorsed by FANUC.