Code M01-1250: NC/PLC axis switch illegal
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical NC/PLC axis switch illegal 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 following operation was performed to an axis whic h can be switched over betwe en NC axis and PLC axis. PLC axis switchover signal was turned ON or OFF when it was prohibited to switch over the axis. Remedy Make sure the axis switchover stat us signal is OFF and change the ON/O FF of the axis switchover signal.
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 M01-1250 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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