Code S53-268: 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
[Saved position at power shut OFF] and [restored positi on at power ON] are inconsistent in SLP/SCA encoder diagnosis during power OFF. Displays the name of axis with error. Remedy There are two causes of this alarm; one is "the axis being moved during power OFF" and the other is "the in- correct restoring of the position at power ON". When it is likely with the cause "the axis being moved during power OFF", the alarm can be cancelled by turning ON the Safety reset signal while the Special safety alarm cancel signal is ON. When it is likely with the cause "the incorrect restoring of t he position at power ON", encoder may be faulty. Contact our service center.
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 S53-268 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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