Code V52-0001: PLC safety stop is active
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical PLC safety stop is active 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 A PLC input signal "Safe stop 1 request" or "S afe torque off request" is OFF (normal close). The screen displays the name of axis for which the said signal is OFF. Remedy Ensure the safety of the machine, and then turn ON ei ther Safe stop 1 request signal or Safe torque off request signal. servation Alarm (V) Warning on 24Hr continuous ON 0001 Unit info
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 V52-0001 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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