Code U10-000: Illegal PLC 0x04xx.yy
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Illegal PLC 0x04xx.yy 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 Software instruction interruption illegal An error was found in data for the sequence program in execution. (1) Sequence program stored in the built-in ROM is broken. (2) Sequence program under development (bef ore writing into F-ROM) is broken. Remedy Contact Mitsubishi.
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 U10-000 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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