What the 0x46 alarm means

Joint 4 reached its positive limit zone; the alarm auto-resets when the joint rotates back out of the zone. We fix this Dobot Magician / MG400 / M1 / CR (DobotStudio) fault almost daily, and one round of on-site checks usually confirms what is going on.

Most common causes

  • Tool rotation past the positive end of travel
  • Taught orientation at the limit
  • Continuous rotation accumulating to the limit
  • Wrong tool frame
Field note: We have tallied real cases: the first cause tops the list, so start your diagnosis there.

Step-by-step field fix

  1. Jog joint 4 back out of the zone — auto-reset
  2. Re-teach the orientation with margin
  3. Unwind continuous rotation periodically
  4. Verify the tool frame
  5. Re-test the path
Safety first: For Dobot 0x46, 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 4 back out of the zone — auto-reset; anything past that falls under the arm working envelope and needs a certified engineer.

How we diagnose motion alarms on site

Dobot 0x46 belongs to the motion & path family. On Dobot 0x46 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 0x46 at DobotStudio / app alarm messages; error codes are hexadecimal with a 0x prefix.

The chain involved in Dobot 0x46 runs: program command -> trajectory planner -> joint targets -> servo execution -> actual position feedback -> deviation compare.

The clearest field clue for Dobot 0x46 is Tool rotation past the positive 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 0x46 (Joint 4 Positive Limit Reached); written by the Henghuan repair team, updated 2026-10-01.

Not sure? Don't force it — contact an engineer

Send the alarm code, the robot model and a description of what was happening at the alarm. Our engineers handle Dobot 0x46 every day, and remote diagnosis by phone/video is free.

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

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 0x46 alarm mean?

Joint 4 reached its positive limit zone; the alarm auto-resets when the joint rotates back out of the zone. We fix this Dobot Magician / MG400 / M1 / CR (DobotStudio) fault almost daily, and one round of on-site checks usually confirms what is going on. Dobot 0x46 sits in the motion & path family; on our work orders the highest-frequency trigger for this code is "Tool rotation past the positive end of travel".

QCan I clear a Dobot 0x46 alarm myself?

Whether Dobot 0x46 clears on its own depends on the outcome of "Jog joint 4 back out of the zone — auto-reset". Finish the flow with "Re-test the path" to confirm Dobot 0x46 - do not skip it. If that step is clean, the second most frequent cause on Dobot 0x46 is "Taught orientation at the limit". Two attempts and still there means stop: Dobot 0x46 involves the arm working envelope, and running Dobot 0x46 on can turn a repairable fault into a replacement.

QFor motion alarms like Dobot 0x46, can you triage remotely first?

The commonest causes we see on Dobot 0x46 are "Tool rotation past the positive end of travel, Taught orientation at the limit, Continuous rotation accumulating to the limit", so we stock the van against those. For Dobot 0x46 specifically, we carry mechanical and configuration items: grease, limit switches, drag-chain segments, encoder cables and the parameter sheets for common reducers. For Dobot 0x46, motion alarms can often be narrowed remotely first, so an on-site visit is not always immediate. Before we roll, tell us what Dobot 0x46 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.

The content on Dobot 0x46 was written by Henghuan Robotics service engineers from hands-on repair experience. Alarm descriptions are our own reference summary and may differ by controller or software version — defer to Dobot documentation, or contact us to confirm. Henghuan is an independent service provider with no affiliation or endorsement by Dobot.