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Code M01-0158: Dir cmnd mode restart invalid

Issue Description & Safety Warning

The Mitsubishi M800/M80 CNC has triggered a critical Dir cmnd mode restart invalid 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 Cycle start was carried out without reset after the retract indirect command mode. Remedy Finish the machining for now by resetting the NC. No speed set out of soft limit 0160 Details [No speed set out of soft limit] The axis, without any maximum speed outside of the soft limit range set, was returned from the outside of the soft limit range. [Aux ax sta No. illegal] A station No. exceeding the No. of indexed divisions was designated. Remedy [No speed set out of soft limit] Correct the parameter "#2021 out_f" (Maximumspeed outside soft limit range) setting. Correct the soft limit range (with the parameter "#2013OT-" (Soft limit I-) and "#2014 OT+" (Soft limit I+)). [Aux ax sta No. illegal] Correctly designate the station No. Aux ax R-pnt ret incomplete 0161 Details Automatic/manual operation was started before referenceposition return was executed with the incremental system. Remedy Execute the reference position return. Aux abs position initializing 0162 Details The start signal was input while initializing the absolute position reference point. Remedy Complete the absolute position reference point initialization. Aux ax abs position error 0163 Details The start signal was input during an absolute position alarm. Remedy Initialize the absolute position reference point and then fix the absolute position coordinates. Aux ax arbitrary positioning 0164 Details The manual operation mode was startedduring the random positioning mode. Remedy Turn the random positioning mode OFF before switching to the manual operation mode. Aux uneven index sta No. ilgl 0165 Details The commanded station No. was higher than 20 or thenumber of indexing stations during uneven indexing. The station No.0 was specified during uneven indexing. Remedy Check the commanded station No. and theparameter "#12801 aux_station" setting. Aux axis changeover error 0166 Details One of the following attempts was made on an axis that is switchable between NCaxis and auxiliary axis. A command intended for an NC axis in manual mode was issued to an auxiliary axis. NC axis control select signal was turned OFF while the NC axis was in motion. NC axis control select signal was turned ONwhile the auxiliary axis was in motion. Remedy If you wish to issue a command intended for an NC axis in manual mode, turn ON the NC axis control select signal so as to set the axis as an NC axis. Do not change NC axis control select signal while the axis is in motion.

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 M01-0158 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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