What the MOTN-017 alarm means

The commanded position is beyond the software stroke limit of the axis. This is one of the most common faults in our repair logs for the FANUC R-30iA / R-30iB / R-30iB Plus platform, and the first inspection typically locates the cause.

Most common causes

  • Programmed point outside axis limits
  • Wrong user frame making valid points unreachable
  • Mastering shifted after service
Field note: Field experience says the first cause is the most likely — verify it before moving on to the rest.

Step-by-step field fix

  1. Jog the axis back within limits to clear
  2. Review the taught point and the active user/tool frame
  3. If the problem started after service, verify mastering
Safety first: For FANUC motn-017, 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 the axis back within limits to clear; anything past that falls under the arm working envelope and needs a certified engineer.

How we diagnose motion alarms on site

FANUC motn-017 belongs to the motion & path family. On FANUC motn-017 the failing stage is alpha-i / beta-i servo amplifiers with PSM supply modules and SVM servo modules (SPM where spindles fit) on the R-30iB Plus / R-30iB Mate Plus / R-30iA - the gap between command and execution: trajectory planning, joint limits, singularities, following error and mechanical resistance. We start reading FANUC motn-017 at the iPendant ALARM screen (SRVO / MOTN / SYST / INTF prefixes) together with the amplifier's 7-segment status code.

The chain involved in FANUC motn-017 runs: program command -> trajectory planner -> joint targets -> servo execution -> actual position feedback -> deviation compare.

First check whether FANUC motn-017 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 FANUC motn-017 (Limit Error (Group / Axis)); written by the Henghuan repair team, updated 2026-10-01.

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Related Motion & Path alarms

MOTN-018 — Position Not Reachable MOTN-023 — In Singularity MOTN-056 — Speed Limits Used
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: see our KUKA, ABB, Yaskawa and Universal Robots field-fix libraries — or the full 10-brand hub.

Frequently asked questions

QWhat does the FANUC motn-017 alarm mean?

The commanded position is beyond the software stroke limit of the axis. This is one of the most common faults in our repair logs for the FANUC R-30iA / R-30iB / R-30iB Plus platform, and the first inspection typically locates the cause. FANUC motn-017 sits in the motion & path family; on our work orders the highest-frequency trigger for this code is "Programmed point outside axis limits".

QCan I clear a FANUC motn-017 alarm myself?

Whether FANUC motn-017 clears on its own depends on the outcome of "Jog the axis back within limits to clear". Finish the flow with "If the problem started after service, verify mastering" to confirm FANUC motn-017 - do not skip it. If that step is clean, the second most frequent cause on FANUC motn-017 is "Wrong user frame making valid points unreachable". Do not chase takt through a repeating FANUC motn-017. Left alone, motion & path faults tend to graduate from repairable to must-replace.

QFor motion alarms like FANUC motn-017, can you triage remotely first?

The commonest causes we see on FANUC motn-017 are "Programmed point outside axis limits, Wrong user frame making valid points unreachable, Mastering shifted after service", so we stock the van against those. For FANUC motn-017 specifically, we carry mechanical and configuration items: grease, limit switches, drag-chain segments, encoder cables and the parameter sheets for common reducers. For FANUC motn-017, motion alarms can often be narrowed remotely first, so an on-site visit is not always immediate. Before we roll, tell us what FANUC motn-017 shows on the iPendant ALARM screen (SRVO / MOTN / SYST / INTF prefixes) together with the amplifier's 7-segment status code and what the machine was doing - phone or video triage is free.

The notes on FANUC motn-017 were summarized by the Henghuan Robotics repair team from on-site service. The alarm interpretation is our empirical summary for troubleshooting reference and may vary by controller and software version — please check FANUC documentation or contact us with questions. Henghuan is an independent service provider, not affiliated with or endorsed by FANUC.