Mitsubishi Electric QD77MS User Manual page 268

Storage item
[Md.23] Axis error No.
[Md.24] Axis warning No.
[Md.25] Valid M code
[Md.26] Axis operation status
When an axis error is detected, the error code corresponding to the error details is
stored.

The latest error code is always stored.
(When a new axis error occurs, the error code is overwritten.)

When "[Cd.5] Axis error reset" (axis control data) turns ON, the axis error No. is
cleared (set to 0).
Refresh cycle: Immediate
Whenever an axis warning is reported, a related warning code is stored.

This area stores the latest warning code always. (Whenever an axis warning is
reported, a new warning code replaces the stored warning code.)

When the "[Cd.5] Axis error reset" (axis control data) is set to ON, the axis
warning No. is cleared to "0".
Refresh cycle: Immediate
This area stores an M code that is currently active (i.e. set to the positioning data
relating to the current operation).
When the PLC READY signal [Y0] goes OFF, the value is set to "0".
Refresh cycle: Immediate
This area stores the axis operation status.
Refresh cycle: Immediate
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Chapter 5 Data Used for Positioning Control
Storage details