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FANUC Controller
Program/G-code · Intermediate · 15-30 minutes
Fanuc Alarm 5073 - NO DECIMAL POINT
Fanuc alarm 5073 NO DECIMAL POINT occurs when a G-code or MDI command requires a decimal point specification but none was provided. This typically affects feedrate commands (F), spindle speed commands (S), or coordinate values where the control expects explicit decimal notation based on parameter settings or address word requirements.
5073
Fanuc Alarm 5073 - NO DECIMAL POINT
SYSTEM ALARM 5073
Fanuc alarm 5073: SYSTEM ALARM 5073. 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
Fanuc alarm 5073 NO DECIMAL POINT occurs when a G-code or MDI command requires a decimal point specification but none was provided. This typically affects feedrate commands (F), spindle speed commands (S), or coordinate values where the control expects explicit decimal notation based on parameter settings or address word requirements.
Causes and Fixes
- 1
Navigate to SYSTEM > PARAM and check parameter 3401 bit 0 (DPI). If DPI=1, all F and S codes require decimal point notation (e.g., F100.0 not F100).
- 2
Review the alarm line number displayed on screen and examine the part program or MDI command at that line for F or S codes without decimal points.
- 3
Correct the program by adding decimal points to all F and S codes (e.g., change F500 to F500.0, S1200 to S1200.0).
- 4
If parameter 3401#0=0 but alarm persists, verify parameter 3405 (F code input unit) is not set to require decimal notation for fractional feedrates.
Call a technician if:
- ·Parameter corruption requiring factory defaults
- ·Persistent alarm after all format corrections
- ·System memory errors affecting program storage
Prevention
- Always include decimal points in numerical values when parameter 3401 bit 0 is enabled
- Use consistent number formatting throughout programs
- Validate programs with CHECK function before execution
- Document parameter settings for decimal point requirements
Common Mistakes
- Assuming integer format works when decimal parameters are enabled
- Copying programs between machines with different parameter settings
- Manual parameter entry without decimal notation
- Using old program format on updated control systems
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