Axis Monitor Data - Mitsubishi Electric MELSEC-Q Series User Manual

5.6.2 Axis monitor data

Storage item
[Md.20] Feed current value
[Md.21] Feed machine value
[Md.22] Feedrate
[Md.23] Axis error No.
The currently commanded address is stored.
(Different from the actual motor position during operation)
The current position address is stored.
If "degree" is selected as the unit, the addresses will have a ring structure for values
between 0 and 359.99999 degrees.

The HP address is stored when the machine HPR is completed.

When the current value is changed with the current value changing function, the
changed value is stored.
Refresh cycle: Operation cycle
The address of the current position according to the machine coordinates will be
stored. (Different from the actual motor position during operation)
Note that the current value changing function will not change the feed machine
value.
Under the speed control mode, the feed machine value is constantly updated
always, irrespective of the parameter setting.
The value will not be cleared to "0" at the beginning of fixed-feed control.
Even if "degree" is selected as the unit, the addresses will become a cumulative
value. (They will not have a ring structure for values between 0 and 359.99999
degrees).
However, the feed machine value is restored with cumulating the feed machine
value before the power supply OFF (the rounded value within the range of 0 to
359.99999 degrees) to the movement amount during the power supply OFF at the
communication start with servo amplifier after the power supply ON or PLC CPU
reset.

Machine coordinates: Characteristic coordinates determined with machine
Refresh cycle: Operation cycle
The speed of the operating workpiece is stored. (May be different from the actual
motor speed during operation)

During interpolation operation, the speed is stored in the following manner.
Reference axis : Composite speed or reference axis speed (Set with [Pr.20])
Interpolation axis : 0
Refresh cycle: Operation cycle
POINT
In case of the single axis operation, "[Md.22] Feedrate" and "[Md.28] Axis
feedrate" are identical.
In the composite mode of the interpolation operation, "[Md.22] Feedrate" is a
speed in a composite direction and "[Md.28] Axis feedrate" is that in each axial
direction.
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
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Chapter 5 Data Used for Positioning Control
Storage details