Code P179-000: Illegal group No.
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Illegal group No. alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Details A duplicate group No. was found at the registrati on of the tool life management data with G10. A group No. that was not registered wa s designated during the T****99 command. An M code command, which must be issued as a single command, coexists in the same block as that of another M code command. The M code commands set in the same group exist in the same block. Remedy Register the estimated tool life dat a/cumulative usage data once for one group: commanding with a dupli- cate group No. is not allowed. Correct to the group No.
Source: Mitsubishi M800/M80/E80 Series Alarm/Parameter Manual (IB-1501279)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Mitsubishi M800/M80 CNC Alarms
Mitsubishi controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code P179-000 on the M800/M80 CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Mitsubishi's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 722 Mitsubishi M800/M80 CNC codes.
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