FANUC codes
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FANUC Controller

Program/G-code · Basic · 5 minutes

Alarm PS006

Fanuc Alarm PS006 - Sign Error

PS006 alarm occurs when the CNC detects a minus sign (-) used with an address code that does not accept negative values, or when multiple minus signs appear consecutively in a program block. This is a program syntax error detected during program execution or background edit check, commonly caused by incorrect G-code syntax or improper sign usage on addresses like T, M, S, H, or D codes.

FANUCProgram/G-codeBasic5 minutes

PS006

Fanuc Alarm PS006 - Sign Error

ILLEGAL USE OF MINUS SIGN

Minus sign used incorrectly - either after an address that does not allow negative values, or multiple minus signs.

Root Cause Summary

PS006 alarm occurs when the CNC detects a minus sign (-) used with an address code that does not accept negative values, or when multiple minus signs appear consecutively in a program block. This is a program syntax error detected during program execution or background edit check, commonly caused by incorrect G-code syntax or improper sign usage on addresses like T, M, S, H, or D codes.

Safety

  • Check direction commands carefully

Causes and Fixes

  1. 1

    Press ALARM button and note the program number, block number (N-number), and sequence displayed on the alarm screen. Record the exact block causing PS006.

  2. 2

    Press EDIT or PRGRM soft key, navigate to the flagged program and block. Search for minus signs (-) adjacent to address codes T, M, S, H, D, G, or second auxiliary function codes.

  3. 3

    Remove the minus sign from the invalid address. Common errors: T-01 should be T01, M-30 should be M30, S-1000 should be S1000, H-01 should be H01, D-01 should be D01.

  4. 4

    Reset alarm (RESET key), re-run the program from a safe position using single block mode (SBL button) to verify correction.

Service Recommended confidence

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