
axismd.ai
FANUC Controller
Program/G-code · Basic · 10 minutes
Fanuc Alarm PS0017 - Missing Sign in Program
PS0017 occurs during program verification when the control detects a missing mandatory plus (+) or minus (-) sign in a program statement, or when a signed value is used in a context where only unsigned values are valid. This is a syntax error typically found in coordinate values, offsets, or parameter-based programming statements that require explicit sign designation.
Fanuc Alarm PS0017 - Missing Sign in Program
No Plus/Minus
Fanuc PS0017: N-DIGIT ERROR. Too many digits were specified in the sequence number (N-number) in the part program. Fanuc limits the size of N-numbers.
Root Cause Summary
PS0017 occurs during program verification when the control detects a missing mandatory plus (+) or minus (-) sign in a program statement, or when a signed value is used in a context where only unsigned values are valid. This is a syntax error typically found in coordinate values, offsets, or parameter-based programming statements that require explicit sign designation.
Safety
Causes and Fixes
Press ALARM key to view full alarm message and note the displayed program line number (Nxxxx) and O-number where PS0017 occurred.
Navigate to EDIT mode, search for the flagged program block, and examine coordinate values (X, Y, Z, U, V, W, A, B, C) and offset values (H, D codes) for missing + or - signs, especially after address letters.
Check parameter 3404#0 (ISC) which controls incremental/absolute sign requirements. If set to 1, incremental commands (G91) may require explicit signs. Verify programming matches parameter setting.
Changing parameter 3404 affects all incremental programming syntax machine-wide
Correct the program by adding explicit + or - signs where required (e.g., change 'X100.0' to 'X+100.0' or 'X-100.0' if mandatory), save the program, reset alarm with RESET key, and re-verify program syntax.
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.
Start freeWas this guide helpful?
Always verify with your machine manual or a certified technician before performing service procedures.