What the 0x43 alarm means

Joint 2 reached its negative limit zone; the alarm auto-resets when the joint moves back out. This is a fault we handle frequently on Dobot Magician / MG400 / M1 / CR (DobotStudio) systems — in most cases we can pin down the root cause on the first site visit.

Most common causes

  • Move commanded past the negative end of travel
  • Taught point at the limit
  • Offset accumulation
  • Wrong home reference
Field note: The first item on this list is what we hit most often on real machines — clear that one before going deeper.

Step-by-step field fix

  1. Jog joint 2 back up out of the zone to clear the alarm
  2. Re-teach the offending points
  3. Check for offset accumulation in the program
  4. Verify home reference
  5. Dry-run the corrected path
Safety first: For Dobot 0x43, 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. The self-serviceable action is Jog joint 2 back up out of the zone to clear the alarm; anything past that falls under the arm working envelope and needs a certified engineer.

How we diagnose motion alarms on site

Dobot 0x43 belongs to the motion & path family. On Dobot 0x43 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 0x43 at DobotStudio / app alarm messages; error codes are hexadecimal with a 0x prefix.

The chain involved in Dobot 0x43 runs: program command -> trajectory planner -> joint targets -> servo execution -> actual position feedback -> deviation compare.

First check whether Dobot 0x43 only appears at one pose - A six-axis arm near wrist extension or near axis-5 zero has a Jacobian approaching singularity: tiny tool moves demand huge joint rates, and the controller either reports following error or the arm snaps through. When the report is alarms at one position and clean on another path, suspect the singular region first. The fix is not raising speed limits but routing around it: move the part, add an intermediate point, or pass the region in joint interpolation.

Field notes on this page cover Dobot 0x43 (Joint 2 Negative Limit Reached); written by the Henghuan repair team, updated 2026-10-01.

Can't find the cause? One call can pinpoint it

Tell us the alarm code, the model and what the machine was doing when the alarm appeared. Dobot 0x43 is an everyday diagnosis for our engineers, and remote diagnosis (phone or video) costs nothing.

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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 0x43 alarm mean?

Joint 2 reached its negative limit zone; the alarm auto-resets when the joint moves back out. This is a fault we handle frequently on Dobot Magician / MG400 / M1 / CR (DobotStudio) systems — in most cases we can pin down the root cause on the first site visit. Dobot 0x43 sits in the motion & path family; on our work orders the highest-frequency trigger for this code is "Move commanded past the negative end of travel".

QCan I clear a Dobot 0x43 alarm myself?

Whether Dobot 0x43 clears on its own depends on the outcome of "Jog joint 2 back up out of the zone to clear the alarm". Finish the flow with "Dry-run the corrected path" to confirm Dobot 0x43 - do not skip it. If that step is clean, the second most frequent cause on Dobot 0x43 is "Taught point at the limit". Two attempts and still there means stop: Dobot 0x43 involves the arm working envelope, and running Dobot 0x43 on can turn a repairable fault into a replacement.

QFor motion alarms like Dobot 0x43, can you triage remotely first?

The commonest causes we see on Dobot 0x43 are "Move commanded past the negative end of travel, Taught point at the limit, Offset accumulation", so we stock the van against those. For Dobot 0x43 specifically, we carry mechanical and configuration items: grease, limit switches, drag-chain segments, encoder cables and the parameter sheets for common reducers. For Dobot 0x43, motion alarms can often be narrowed remotely first, so an on-site visit is not always immediate. Before we roll, tell us what Dobot 0x43 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 0x43 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.