Code S53-105: Safety Function Warnings
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Safety Function Warnings 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
Label branching error (Before executing PLC) Occurs only when the bit selection parameter (#6452 bit6) "branch destination label check valid" is set to "1". (1) The CJ and CALL instructions we re placed to a nonexistent label. (2) The CJ instruction was placed to the global label . (Branching is possible only with the CALL instruction.) Remedy Check the branch destination of the CJ and CALL instructions existing in the steps occurred. Illegal PLC 0x21xx.yy Step 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 S53-105 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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