Mark Detection; Current Position Latch Function - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

12. APPLICATION OF FUNCTIONS

12.2 Mark detection

12.2.1 Current position latch function

When the mark detection signal turns on, the current position is latched. The latched data can be read with
communication commands.
(1) Communication command
Reads mark detection data.
Command Data No.
[1] [A] [0] [0] MSD (Mark detection) rising latch data (data part)
[0] [1] MSD (Mark detection) falling latch data (data part)
[0] [2] MSD (Mark detection) rising latch data (data part + additional information)
[0] [3] MSD (Mark detection) falling latch data (data part + additional information)
POINT
The current position latch function can be used with the point table method and
the program method. However, the current position latch function is disabled in
the following condition.
Home position return
Manual operation (excluding home position return)
The latched actual current position data can be read with communication
commands.
For the servo amplifiers with software version B6 or earlier, the latched position
data is not compatible with the current position of the state monitor when the roll
feed display function is enabled. Disable the roll feed display function to
compare the current data of the state monitor and the latched position data.
For the servo amplifiers with software version B7 or later, the read latched
position data is equal to the travel distance as the starting point is set to "0"
when the roll reed display function is enabled. The output value is the same as
the current position of the state monitor.
Description
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