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    Fanuc Alarm 22: NO CIRCULAR RADIUS

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 22: NO CIRCULAR RADIUS Fanus Control Model: 16/18/21 Fanuc Alarm Description When circular interpolation is specified, neither R (specifying an arc radius), nor I, J, and K (specifying the distance from a start point to the center) is specified.

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  • CNC Alarms

    Fanuc Alarm 21: ILLEGAL PLANE AXIS COMMANDED

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 21: ILLEGAL PLANE AXIS COMMANDED Fanus Control Model: 16/18/21 Fanuc Alarm Description An axis not included in the selected plane (by using G17, G18, G19) was commanded in circular interpolation. Modify the program.

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  • CNC Alarms

    Fanuc Alarm 20: OVER TOLERANCE OF RADIUS

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 20: OVER TOLERANCE OF RADIUS Fanus Control Model: 16/18/21 Fanuc Alarm Description In circular interpolation (G02 or G03), difference of the distance between the start point and the center of an arc and that between the end point and the center of the arc exceeded the value specified in parameter No. 3410.

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  • CNC Alarms

    Fanuc Alarm 14: CAN NOT COMMAND G95 / ILLEGAL LEAD COMMAND

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 14: CAN NOT COMMAND G95 / ILLEGAL LEAD COMMAND Fanus Control Model: 16/18/21 Fanuc Alarm Description (M Series) A synchronous feed is specified without the option for threading / synchronous feed. (T Series) In variable lead threading, the lead incremental and decremental outputted by address K exceed the maximum command value or a…

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  • CNC Alarms

    Fanuc Alarm 11: NO FEEDRATE COMMANDED

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 11: NO FEEDRATE COMMANDED Fanus Control Model: 16/18/21 Fanuc Alarm Description Feedrate was not commanded to a cutting feed or the feedrate was inadequate. Modify the program.

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  • CNC Alarms

    Fanuc Alarm 10: IMPROPER G–CODE

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 10: IMPROPER G–CODE Fanus Control Model: 16/18/21 Fanuc Alarm Description An unusable G code or G code corresponding to the function not provided is specified. Modify the program.

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  • CNC Alarms

    Fanuc Alarm 9: ILLEGAL ADDRESS INPUT

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 9: ILLEGAL ADDRESS INPUT Fanus Control Model: 16/18/21 Fanuc Alarm Description Unusable character was input in significant area. Modify the program.

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  • CNC Alarms

    Fanuc Alarm 7: ILLEGAL USE OF DECIMAL POINT

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 7: ILLEGAL USE OF DECIMAL POINT Fanus Control Model: 16/18/21 Fanuc Alarm Description Decimal point “.” input error (A decimal point was input after an address with which it can not be used. Or two decimal points were input.) Modify the program.

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  • CNC Alarms

    Fanuc Alarm 6: ILLEGAL USE OF NEGATIVE SIGN

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 6: ILLEGAL USE OF NEGATIVE SIGN Fanus Control Model: 16/18/21 Fanuc Alarm Description Sign “ – ” input error (Sign “ – ” was input after an address with which it cannot be used. Or two or more “ – ” signs were input.) Modify the program.

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  • CNC Alarms

    Fanuc Alarm 5: NO DATA AFTER ADDRESS

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 5: NO DATA AFTER ADDRESS Fanus Control Model: 16/18/21 Fanuc Alarm Description The address was not followed by the appropriate data but was followed by another address or EOB code. Modify the program.

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  • CNC Alarms

    Fanuc Alarm 4: ADDRESS NOT FOUND

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 4: ADDRESS NOT FOUND Fanus Control Model: 16/18/21 Fanuc Alarm Description A numeral or the sign “ – ” was input without an address at the beginning of a block. Modify the program.

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  • CNC Alarms

    Fanuc Alarm 3: TOO MANY DIGITS

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 3: TOO MANY DIGITS Fanus Control Model: 16/18/21 Fanuc Alarm Description Data exceeding the maximum allowable number of digits was input. (Refer to the item of max. programmable dimensions.)

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  • CNC Alarms

    Fanuc Alarm 2: TV PARITY ALARM

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 2: TV PARITY ALARM Fanus Control Model: 16/18/21 Fanuc Alarm Description TV alarm (The number of characters in a block is odd). This alarm will be generated only when the TV check is effective.

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  • CNC Alarms

    Fanuc Alarm 1: TH PARITY ALARM

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 1: TH PARITY ALARM Fanus Control Model: 16/18/21 Fanuc Alarm Description TH alarm (A character with incorrect parity was input). Correct the tape.

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  • CNC Alarms

    Fanuc Alarm 0: PLEASE TURN OFF POWER

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 0: PLEASE TURN OFF POWER Fanus Control Model: 16/18/21 Fanuc Alarm Description A parameter which requires the power off was input, turn off power.

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  • CNC Alarms

    Fanuc Alarm 118: PARENTHESIS NESTING ERROR

    ByCNC Hub Team May 28, 2026May 28, 2026

    Fanuc Alarm 118: PARENTHESIS NESTING ERROR Fanus Control Model: 16/18/21 Fanuc Alarm Description The nesting level of brackets or parentheses in a macro expression exceeds the limit of 5 levels.

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  • CNC Alarms

    Fanuc Alarm 36: CAN NOT COMMANDED G31

    ByCNC Hub Team May 18, 2026May 18, 2026

    Fanuc Alarm 036 (or P/S 36): CAN NOT COMMANDED G31 Fanus Control Model: Series 16/18/21 Description This alarm occurs when a skip cutting command (G31) is called while the machine is actively using cutter compensation (G41 or G42) or tool nose radius compensation. How to Fix Alarm Cancel cutter compensation by writing G40 before issuing…

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  • CNC Alarms

    Fanuc Alarm 34: NO CIRC ALLOWED IN ST–UP /EXT BLK

    ByCNC Hub Team May 17, 2026May 17, 2026

    Fanuc Alarm 34: NO CIRC ALLOWED IN ST–UP /EXT BLK Fanus Control Model: Series 0i / 16i / 18i / 21i / 31i / 32i Description This alarm (Fanuc Alarm 34) occurs when you are starting (Start-up block) or ending (Cancel block) Cutter Radius Compensation using G41 or G42, and write Circular Interpolation (G02/G03) instead…

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  • CNC Alarms

    Fanuc CNC Alarm 33: NO SOLUTION AT CRC

    ByCNC Hub Team May 17, 2026May 17, 2026

    Fanuc CNC Alarm 33: NO SOLUTION AT CRC Fanus Control Model: Series 16 / 18 / 21 (M and T Series) Description During tool radius compensation (G41/G42), the intersection point of two geometric lines or arcs fails to be detected. How to Fix Alarm Correct the tool path in the G-code program, or go to…

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  • CNC Alarms

    Fanuc Alarm 31: ILLEGAL P COMMAND IN G10

    ByCNC Hub Team May 17, 2026May 17, 2026

    Fanuc Alarm 31: ILLEGAL P COMMAND IN G10 Fanus Control Model: Series 16i / 18i / 21i (Models A and B) and Series 30i / 31i / 32i Description When you use the ‘P’ command incorrectly with a G10 code. The value written after ‘P’ is either outside the offset number that is available in…

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