FANUC codes
FANUCProgram/G-codeIntermediate10-20 minutes

018

Fanuc Alarm 018 - NC Statement Syntax Error

NC Statement Error

Fanuc alarm 018: NC Statement Error. This alarm indicates a fault condition detected by the Fanuc control. Refer to the alarm number and name to identify the specific system or function involved.

Root Cause Summary

Alarm 018 occurs when the CNC control detects a syntax error in the NC program statement being executed or processed. This typically results from incorrect G-code formatting, invalid address combinations, missing required parameters, or prohibited character usage that violates the control's programming rules.

Safety

  • Program will not run

Causes and Fixes

  1. 1

    Identify the exact line number from the alarm display or program cursor position where execution stopped.

  2. 2

    Check for common syntax errors: missing spaces between addresses, decimal point errors (e.g., X1.2.3), invalid characters (special symbols where not allowed), or improper use of parentheses in comments.

  3. 3

    Verify address letter and number combinations follow proper format (e.g., G01 not G1.0, X10.5 not X10.5.0). Check that all addresses have valid numeric values.

  4. 4

    Correct the syntax error, re-verify the corrected line against programming manual specifications, and reset the alarm to test the program.

Service Recommended confidence

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