Code Y20-0011: Device setting illegal
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Device setting 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 device set in the parameter "#1353 MC_ct1" (C ontactor shutoff output 1 dev ice) does not exist. The device set in the parameter "#1353 MC_ct1" (Contact or shutoff output 1 device) is used as an output device in PLC program. Remedy In the parameter "#1353 MC_ct1" (Contactor shutoff ou tput 1 device), set the device to which a remote I/ O is connected. Use the device to control the contactor. Confirm that the devices set by the parameter "#13 53 MC_ct1" (Contactor shutof f output 1 device)" are not used as an output device in PLC program. Restart the NC.
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 Y20-0011 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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