What the 0x0F0102 alarm means

An E-stop input is active; servo power is cut as designed. If no button is pressed, the safety loop itself has a fault. This is a routine repair in our workshop for JAKA Zu / JAKA Pro cobots (APP) systems, and we normally pin it down during the first site check.

Most common causes

  • Pendant or external E-stop pressed
  • E-stop loop wiring open
  • Safety relay fault
  • External safety device holding the loop open
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. Release every E-stop in the cell
  2. Press safety reset after release
  3. Meter the E-stop loop if the alarm stays
  4. Check external safety devices (scanners, mats)
  5. Re-enable and test the enable switch before running
Safety first: For JAKA 0x0f0102, 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. On site you may look at after confirming power-off the first step yourself: Release every E-stop in the cell. Beyond that it is the e-stop chain and safety circuit work - leave it to a professional.

How we diagnose safety-chain faults on site

JAKA 0x0f0102 belongs to the safety chain & e-stop family. On JAKA 0x0f0102 the failing stage is collaborative safety (collision detection, safe limits, force control) on the JAKA collaborative robot cabinet - continuity of one series loop: e-stop buttons, door switches, light curtains, safety relays and the enabling device. We start reading JAKA 0x0f0102 at the pendant and app alarm pages; codes are hexadecimal with a 0x prefix.

The chain involved in JAKA 0x0f0102 runs: e-stop / door / curtain -> safety relay (dual channel) -> controller safety input -> motor-off and brake apply.

On JAKA 0x0f0102 the field usually reports Pendant or external E-stop 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 JAKA 0x0f0102 (Emergency Stop Active); written by the Henghuan repair team, updated 2026-10-01.

Still guessing? Let a professional engineer save you time

Share the alarm code, machine model and the operating condition at the moment of the alarm. Our engineers are highly experienced with JAKA 0x0f0102, and remote diagnosis (phone/video) is completely free.

Get a Free Remote Diagnosis See Repair Services

Hotline: +86-20-39029800 · WhatsApp: +86-188-1886-2860

Related Safety Chain & E-Stop alarms

0x000035 — Collision Detected 0x0F0103 — Safety I/O Configuration Error
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 AUBO · ROKAE · Dobot and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the JAKA 0x0f0102 alarm mean?

An E-stop input is active; servo power is cut as designed. If no button is pressed, the safety loop itself has a fault. This is a routine repair in our workshop for JAKA Zu / JAKA Pro cobots (APP) systems, and we normally pin it down during the first site check. JAKA 0x0f0102 sits in the safety chain & e-stop family; on our work orders the highest-frequency trigger for this code is "Pendant or external E-stop pressed".

QCan I clear a JAKA 0x0f0102 alarm myself?

Whether JAKA 0x0f0102 clears on its own depends on the outcome of "Release every E-stop in the cell". Finish the flow with "Re-enable and test the enable switch before running" to confirm JAKA 0x0f0102 - do not skip it. If that step is clean, the second most frequent cause on JAKA 0x0f0102 is "E-stop loop wiring open". When JAKA 0x0f0102 keeps coming back it is not a one-off trigger - especially if Re-enable and test the enable switch before running is where you get stuck. Do not keep producing through JAKA 0x0f0102.

QA safety-chain fault like JAKA 0x0f0102 stops the line - how fast can you be here?

The commonest causes we see on JAKA 0x0f0102 are "Pendant or external E-stop pressed, E-stop loop wiring open, Safety relay fault", so we stock the van against those. For JAKA 0x0f0102 specifically, we stock along the loop: safety relays, common door switches, e-stop buttons, light-curtain pairs and terminal blocks. For JAKA 0x0f0102, 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 JAKA 0x0f0102 shows on the pendant and app alarm pages; codes are hexadecimal with a 0x prefix and what the machine was doing - phone or video triage is free.

This page on JAKA 0x0f0102 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 JAKA documentation or contact us if in doubt. Henghuan is an independent service provider, not affiliated with or endorsed by JAKA.