What the 20002 alarm means

The safety configuration (limits, I/O, monitored zones) is invalid or inconsistent, so the controller refuses motion. This is a routine repair in our workshop for AUBO i-series / C-series (ARCS SDK) systems, and we normally pin it down during the first site check.

Most common causes

  • Safety limits edited to impossible values
  • Safety I/O assigned but not wired
  • Configuration file corrupted
  • Firmware updated without migrating the safety config
Field note: Begin with the first item in the list; it has a far higher on-machine occurrence rate than the others.

Step-by-step field fix

  1. Open the safety configuration page and review every limit
  2. Compare safety I/O assignments to the real wiring
  3. Restore a known-good safety configuration
  4. Re-apply and confirm the safety checksum
  5. Function-test all safety inputs before production
Safety first: For AUBO 20002, 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 Open the safety configuration page and review every limit; 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

AUBO 20002 belongs to the safety chain & e-stop family. On AUBO 20002 the failing stage is collaborative safety (collision detection, speed limits, force and current monitoring) on the AUBO collaborative robot controller - continuity of one series loop: e-stop buttons, door switches, light curtains, safety relays and the enabling device. We start reading AUBO 20002 at the pendant alarm list and SDK / ARCS return codes; 1xxxx joint level, 2xxxx / 3xxxx safety and communication.

The chain involved in AUBO 20002 runs: e-stop / door / curtain -> safety relay (dual channel) -> controller safety input -> motor-off and brake apply.

AUBO 20002 is sometimes designed behaviour, not a fault - Releasing the enabling device (three-position switch) in manual mode triggers a protective stop by design, yet plenty of sites report it as an alarm. The switch enables only in the middle position; fully released or pushed through both open - and pushing through is the instinctive panic reaction, which is exactly what the designers used. Knowing that clears a good share of mysterious protective stops. The real fault is worn contacts inside the switch, showing up as poor contact in the middle position.

Field notes on this page cover AUBO 20002 (Safety Configuration Error); written by the Henghuan repair team, updated 2026-10-01.

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Related Safety Chain & E-Stop alarms

30001 — Collision Detected 30002 — Emergency Stop Active
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: we also keep field-fix libraries for ROKAE · Dobot · FANUC and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the AUBO 20002 alarm mean?

The safety configuration (limits, I/O, monitored zones) is invalid or inconsistent, so the controller refuses motion. This is a routine repair in our workshop for AUBO i-series / C-series (ARCS SDK) systems, and we normally pin it down during the first site check. AUBO 20002 sits in the safety chain & e-stop family; on our work orders the highest-frequency trigger for this code is "Safety limits edited to impossible values".

QCan I clear a AUBO 20002 alarm myself?

Whether AUBO 20002 clears on its own depends on the outcome of "Open the safety configuration page and review every limit". Finish the flow with "Function-test all safety inputs before production" to confirm AUBO 20002 - do not skip it. If that step is clean, the second most frequent cause on AUBO 20002 is "Safety I/O assigned but not wired". Do not chase takt through a repeating AUBO 20002. Left alone, safety chain & e-stop faults tend to graduate from repairable to must-replace.

QA safety-chain fault like AUBO 20002 stops the line - how fast can you be here?

The commonest causes we see on AUBO 20002 are "Safety limits edited to impossible values, Safety I/O assigned but not wired, Configuration file corrupted", so we stock the van against those. For AUBO 20002 specifically, we stock along the loop: safety relays, common door switches, e-stop buttons, light-curtain pairs and terminal blocks. For AUBO 20002, 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 AUBO 20002 shows on the pendant alarm list and SDK / ARCS return codes; 1xxxx joint level, 2xxxx / 3xxxx safety and communication and what the machine was doing - phone or video triage is free.

This page on AUBO 20002 was compiled from actual repair records of the Henghuan Robotics repair team. Alarm notes are our own summary for troubleshooting reference only and may vary with controller and software version — please consult AUBO documentation or contact us if in doubt. Henghuan is an independent service provider, not affiliated with or endorsed by AUBO.