Code U60-000: Ladder is not saved
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Ladder is not saved 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 The edited sequence program is not stored in the built-in ROM. (The contents of temporary memory area and sequen ce program in the built -in ROM are mismatched.) Remedy Use GX Developer/GX Works2 or the built-in PLC ed it function to perform write to the built-in ROM. 11 Network Service Errors (N)
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 U60-000 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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