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FANUC Controller
Program/G-code · Intermediate · 5-30 minutes
Fanuc 379 - Scaling parameter error
Alarm 379 occurs when the CNC control detects an invalid scaling (G51) command or parameter in the part program. This is typically caused by incorrect scaling factor values, missing required parameters, or attempting to use scaling when it conflicts with other active modal commands or machine conditions.
379
Fanuc 379 - Scaling parameter error
SCALING PARAMETER ERROR
Fanuc PS program alarm 379: SCALING PARAMETER ERROR. This alarm is triggered by an illegal or incorrectly formatted command in the part program, or a programming condition that the Fanuc control cannot execute.
Root Cause Summary
Alarm 379 occurs when the CNC control detects an invalid scaling (G51) command or parameter in the part program. This is typically caused by incorrect scaling factor values, missing required parameters, or attempting to use scaling when it conflicts with other active modal commands or machine conditions.
Safety
- Verify corrected program or parameters before resuming machining
Causes and Fixes
- 1
Locate the G51 command in the part program at or near the alarm line number displayed on the control.
- 2
Verify the P value in the G51 command is within the valid range (typically P0.001 to P999.999) and is not equal to zero or 1.0 if required by your system.
- 3
Check that the scaling factor uses a decimal point (P2.0) rather than integer format if required, and contains no illegal characters or spaces.
- 4
Correct the P value to a valid scaling factor or remove the G51 command if scaling is not needed, then reset the alarm and restart the program.
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