Code V03-0002: Slave station comm. error 2
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Slave station comm. error 2 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 data received by the safety I/O unit is incorrect. Displays the information of the unit with an error. bit24-27: Unit No. Safety observation target axes are stopped, and all the DOs of the safety I/O un it concerned are turned OFF. (*) The unit No. indicates the unit in which an alarm occurs. The channel No. and station No. to which the unit is connected can be confirmed by the following parame- ters. Channel No.: #51501 + 10 × (Unit No. - 1) Station No.: #51502 + 10 × (Unit No. - 1) Remedy NC unit or safety I/O unit may be faulty . Exchange the NC unit or safety I/O unit.
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 V03-0002 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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