What the 0x41 alarm means

Joint 1 moved to its negative limit zone; jogging back out of the zone clears the alarm automatically. We are very familiar with this alarm on Dobot Magician / MG400 / M1 / CR (DobotStudio) systems — usually the first on-site inspection is enough to confirm the cause.

Most common causes

  • Programmed move beyond the negative end of travel
  • Taught point at the limit with no margin
  • Coordinate frame shifted
  • Home reference wrong after service
Field note: Our ticket data shows the first cause is by far the most common — start there to avoid dead ends.

Step-by-step field fix

  1. Jog joint 1 back in the positive direction to auto-clear the alarm
  2. Re-teach the offending points with margin
  3. Verify the active frame
  4. Confirm the home reference
  5. Test the corrected path at low speed
Safety first: For Dobot 0x41, this alarm family points at arm motion control: after a reset the arm can move unexpectedly, and anyone inside the working envelope is at strike and pinch risk. On site you may look at after confirming power-off the first step yourself: Jog joint 1 back in the positive direction to auto-clear the alarm. Beyond that it is the arm working envelope work - leave it to a professional.

How we diagnose motion alarms on site

Dobot 0x41 belongs to the motion & path family. On Dobot 0x41 the failing stage is joint-integrated drive modules (collaborative models dominate) on the Dobot controllers (CR / MG / Nova series companions) - the gap between command and execution: trajectory planning, joint limits, singularities, following error and mechanical resistance. We start reading Dobot 0x41 at DobotStudio / app alarm messages; error codes are hexadecimal with a 0x prefix.

The chain involved in Dobot 0x41 runs: program command -> trajectory planner -> joint targets -> servo execution -> actual position feedback -> deviation compare.

The clearest field clue for Dobot 0x41 is Programmed move beyond the negative end of travel; the discriminator is this test: The most valuable judgement on motion alarms is separating software from mechanics. We take the fixture off and re-run the same path below 10% speed: if it is clean unloaded and slow, the problem is mechanical - over-heavy tooling, shifted centre of gravity, or a joint that already has drag; if it alarms even unloaded and slow, look at program points, frame calibration and whether the path crosses a singular region. No instruments needed, and it removes half the wrong turns.

Field notes on this page cover Dobot 0x41 (Joint 1 Negative Limit Reached); written by the Henghuan repair team, updated 2026-10-01.

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Related Motion & Path alarms

0x20 — Inverse Kinematics Singularity 0x21 — Inverse Kinematics No Solution — Out of Workspace 0x22 — Inverse Kinematics Over Joint Limit 0x30 — Joint 1 Overspeed 0x31 — Joint 2 Overspeed 0x32 — Joint 3 Overspeed
Same family: this code belongs to the Motion & path alarms family - the page collects all Motion & path-family codes we have handled, with the common inspection order and spares.
Other brands: we also keep field-fix libraries for FANUC · KUKA · ABB and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the Dobot 0x41 alarm mean?

Joint 1 moved to its negative limit zone; jogging back out of the zone clears the alarm automatically. We are very familiar with this alarm on Dobot Magician / MG400 / M1 / CR (DobotStudio) systems — usually the first on-site inspection is enough to confirm the cause. Dobot 0x41 sits in the motion & path family; on our work orders the highest-frequency trigger for this code is "Programmed move beyond the negative end of travel".

QCan I clear a Dobot 0x41 alarm myself?

Whether Dobot 0x41 clears on its own depends on the outcome of "Jog joint 1 back in the positive direction to auto-clear the alarm". Finish the flow with "Test the corrected path at low speed" to confirm Dobot 0x41 - do not skip it. If that step is clean, the second most frequent cause on Dobot 0x41 is "Taught point at the limit with no margin". When Dobot 0x41 keeps coming back it is not a one-off trigger - especially if Test the corrected path at low speed is where you get stuck. Do not keep producing through Dobot 0x41.

QFor motion alarms like Dobot 0x41, can you triage remotely first?

The commonest causes we see on Dobot 0x41 are "Programmed move beyond the negative end of travel, Taught point at the limit with no margin, Coordinate frame shifted", so we stock the van against those. For Dobot 0x41 specifically, we carry mechanical and configuration items: grease, limit switches, drag-chain segments, encoder cables and the parameter sheets for common reducers. For Dobot 0x41, motion alarms can often be narrowed remotely first, so an on-site visit is not always immediate. Before we roll, tell us what Dobot 0x41 shows on DobotStudio / app alarm messages; error codes are hexadecimal with a 0x prefix and what the machine was doing - phone or video triage is free.

This page on Dobot 0x41 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 Dobot documentation or contact us if in doubt. Henghuan is an independent service provider, not affiliated with or endorsed by Dobot.