Skip to content
CNC Programming Hub
  • Home
  • Beginner Guides
  • G-Code & M-Code
  • Machine-Specific
  • Tutorials
  • Resources & Libraries
CNC Programming Hub
  • CNC Alarms

    Fanuc Alarm 5420: ILLEGAL PARAMETER IN G43.4/ G43.5

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5420: ILLEGAL PARAMETER IN G43.4/ G43.5 Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description A parameter related to pivot tool length compensation is incorrect. Have you faced Fanuc Alarm 5420 ILLEGAL PARAMETER IN G43.4/ G43.5 on your machine? Share your experience or troubleshooting tips in the comments…

    Read More Fanuc Alarm 5420: ILLEGAL PARAMETER IN G43.4/ G43.5Continue

  • CNC Alarms

    Fanuc Alarm 5418: NURBS:ILLEGAL KNOT VALUE

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5418: NURBS:ILLEGAL KNOT VALUE Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description Knots do not increase in monotone. Have you faced Fanuc Alarm 5418 NURBS:ILLEGAL KNOT VALUE on your machine? Share your experience or troubleshooting tips in the comments below to help other CNC operators and programmers…

    Read More Fanuc Alarm 5418: NURBS:ILLEGAL KNOT VALUEContinue

  • CNC Alarms

    Fanuc Alarm 5417: NURBS:ILLEGAL MULTI–KNOT

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5417: NURBS:ILLEGAL MULTI–KNOT Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description As many knots as the number of steps are not specified at the start and end points. Have you faced Fanuc Alarm 5417 NURBS:ILLEGAL MULTI–KNOT on your machine? Share your experience or troubleshooting tips in the…

    Read More Fanuc Alarm 5417: NURBS:ILLEGAL MULTI–KNOTContinue

  • CNC Alarms

    Fanuc Alarm 5416: NURBS:ILLEGAL MODE

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5416: NURBS:ILLEGAL MODE Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description A mode that cannot be used with NURBS interpolation mode is specified in NURBS interpolation mode. Have you faced Fanuc Alarm 5416 NURBS:ILLEGAL MODE on your machine? Share your experience or troubleshooting tips in the comments…

    Read More Fanuc Alarm 5416: NURBS:ILLEGAL MODEContinue

  • CNC Alarms

    Fanuc Alarm 5415: NURBS:ILLEGAL CANCEL

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5415: NURBS:ILLEGAL CANCEL Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description Although NURBS interpolation is not completed yet, the NURBS interpolation mode is turned off. Have you faced Fanuc Alarm 5415 NURBS:ILLEGAL CANCEL on your machine? Share your experience or troubleshooting tips in the comments below to…

    Read More Fanuc Alarm 5415: NURBS:ILLEGAL CANCELContinue

  • CNC Alarms

    Fanuc Alarm 5414: NURBS:ILLEGAL KNOT

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5414: NURBS:ILLEGAL KNOT Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description The number of blocks containing knots only is insufficient. Have you faced Fanuc Alarm 5414 NURBS:ILLEGAL KNOT on your machine? Share your experience or troubleshooting tips in the comments below to help other CNC operators and…

    Read More Fanuc Alarm 5414: NURBS:ILLEGAL KNOTContinue

  • CNC Alarms

    Fanuc Alarm 5413: NURBS:ILLEGAL AXIS COMMAND

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5413: NURBS:ILLEGAL AXIS COMMAND Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description An axis not specified with controlled points is specified in the first block. Have you faced Fanuc Alarm 5413 NURBS:ILLEGAL AXIS COMMAND on your machine? Share your experience or troubleshooting tips in the comments below…

    Read More Fanuc Alarm 5413: NURBS:ILLEGAL AXIS COMMANDContinue

  • CNC Alarms

    Fanuc Alarm 5412: NURBS:NO KNOT COMMAND

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5412: NURBS:NO KNOT COMMAND Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description No knot is specified. Alternatively, in NURBS interpolation mode, a block not relating to NURBS interpolation is specified. Have you faced Fanuc Alarm 5412 NURBS:NO KNOT COMMAND on your machine? Share your experience or troubleshooting…

    Read More Fanuc Alarm 5412: NURBS:NO KNOT COMMANDContinue

  • CNC Alarms

    Fanuc Alarm 5411: NURBS:ILLEGAL ORDER

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5411: NURBS:ILLEGAL ORDER Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description The number of steps is specified incorrectly. Have you faced Fanuc Alarm 5411 NURBS:ILLEGAL ORDER on your machine? Share your experience or troubleshooting tips in the comments below to help other CNC operators and programmers clear…

    Read More Fanuc Alarm 5411: NURBS:ILLEGAL ORDERContinue

  • CNC Alarms

    Fanuc Alarm 5409: ILLEGAL PARAMETER IN G41.3

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5409: ILLEGAL PARAMETER IN G41.3 Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description The parameter setting (No. xxxx to xxxx) that determines the relationship between the rotation axis and rotation plane is incorrect. Have you faced Fanuc Alarm 5409 ILLEGAL PARAMETER IN G41.3 on your machine? Share…

    Read More Fanuc Alarm 5409: ILLEGAL PARAMETER IN G41.3Continue

  • CNC Alarms

    Fanuc Alarm 5408: G41.3 ILLEGAL START_UP

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5408: G41.3 ILLEGAL START_UP Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description 1) In a mode of group 01 except G00 and G01, G41.3 (startup) is specified.;2) At startup, the included angle of the tool direction vector and move direction vector is 0 or 180 degrees….

    Read More Fanuc Alarm 5408: G41.3 ILLEGAL START_UPContinue

  • CNC Alarms

    Fanuc Alarm 5302: ILLEGAL COMMAND IN G68 MODE

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5302: ILLEGAL COMMAND IN G68 MODE Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description A command to set the coordinate system is specified in the coordinate system rotation mode. Have you faced Fanuc Alarm 5302 ILLEGAL COMMAND IN G68 MODE on your machine? Share your experience or…

    Read More Fanuc Alarm 5302: ILLEGAL COMMAND IN G68 MODEContinue

  • CNC Alarms

    Fanuc Alarm 5300: SET ALL OFFSET DATAS AGAIN

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5300: SET ALL OFFSET DATAS AGAIN Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description After the inch/metric automatic conversion function (OIM: Bit 0 of parameter No. 5006) for tool offset data is enabled or disabled, all the tool offset data must be reset. This message reminds…

    Read More Fanuc Alarm 5300: SET ALL OFFSET DATAS AGAINContinue

  • CNC Alarms

    Fanuc Alarm 5257: G41/G42 NOT ALLOWED IN MDI MODE

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5257: G41/G42 NOT ALLOWED IN MDI MODE Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description M series;G41/G42 (cutter compensation C: M series) was specified in MDI mode. (Depending on the setting of bit 4 of parameter No. 5008) Have you faced Fanuc Alarm 5257 G41/G42 NOT…

    Read More Fanuc Alarm 5257: G41/G42 NOT ALLOWED IN MDI MODEContinue

  • CNC Alarms

    Fanuc Alarm 5252: ILLEGAL P COMMAND IN G54.2

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5252: ILLEGAL P COMMAND IN G54.2 Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description The P value specifying the offset number of a fixture offset is too large. Correct the program. Have you faced Fanuc Alarm 5252 ILLEGAL P COMMAND IN G54.2 on your machine? Share your…

    Read More Fanuc Alarm 5252: ILLEGAL P COMMAND IN G54.2Continue

  • CNC Alarms

    Fanuc Alarm 5251: ILLEGAL PARAMETER IN G54.2

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5251: ILLEGAL PARAMETER IN G54.2 Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description A fixture offset parameter (No. 7580 to 7588) is illegal. Correct the parameter. Have you faced Fanuc Alarm 5251 ILLEGAL PARAMETER IN G54.2 on your machine? Share your experience or troubleshooting tips in the…

    Read More Fanuc Alarm 5251: ILLEGAL PARAMETER IN G54.2Continue

  • CNC Alarms

    Fanuc Alarm 5245: OTHER AXIS ARE COMMANDED

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5245: OTHER AXIS ARE COMMANDED Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description One of the following command conditions was present during flexible synchronization or when flexible synchronization was turned on;1. The synchronous master axis or slave axis is the EGB axis.;2. The synchronous master axis…

    Read More Fanuc Alarm 5245: OTHER AXIS ARE COMMANDEDContinue

  • CNC Alarms

    Fanuc Alarm 5243: DATA OUT OF RANGE

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5243: DATA OUT OF RANGE Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description The gear ratio is not set correctly. (This alarm is issued when flexible synchronization is turned on.) Have you faced Fanuc Alarm 5243 DATA OUT OF RANGE on your machine? Share your experience or…

    Read More Fanuc Alarm 5243: DATA OUT OF RANGEContinue

  • CNC Alarms

    Fanuc Alarm 416: SERVO ALARM: n–TH AXIS – DISCONNECTION

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 416: SERVO ALARM: n–TH AXIS – DISCONNECTION Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description Position detection system fault in the n–th axis (axis 1–4) pulse coder (disconnection alarm). Refer to diagnosis display No. 200, 201 for details. Have you faced Fanuc Alarm 416 SERVO ALARM:…

    Read More Fanuc Alarm 416: SERVO ALARM: n–TH AXIS – DISCONNECTIONContinue

  • CNC Alarms

    Fanuc Alarm 415: SERVO ALARM: n–TH AXIS – EXCESS SHIFT

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 415: SERVO ALARM: n–TH AXIS – EXCESS SHIFT Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description A speed higher than 524288000 units/s was attempted to be set in the n–th axis (axis 1–8). This error occurs as the result of improperly set CMR. Have you faced…

    Read More Fanuc Alarm 415: SERVO ALARM: n–TH AXIS – EXCESS SHIFTContinue

Page navigation

Previous PagePrevious 1 … 9 10 11 12 13 … 20 Next PageNext
  • About Us – CNC Programming Hub
  • Contact Us
  • Privacy Policy

© 2026 CNC Programming Hub

  • Home
  • Beginner Guides
  • G-Code & M-Code
  • Machine-Specific
  • Tutorials
  • Resources & Libraries
Search