8.2 Settings for Master and Slave Axes
8-3
8.2 Settings for Master and Slave Axes
8.2.1 Selection of Master Axis and Settings
The master axis serves as a reference for synchronization control. Start and stop requests for
various operations are made to the master axis under synchronous control. It is possible to
select one of the following master axes.
Types of master axis
Type Outline
Existing axis
Axes (the 1st to 4th axes) available for the positioning unit.
Use one of them if the master axis needs to be an object of control as well.
If an existing axis is used as the master axis, the rest of the existing axes (three axes) can be
used as slave axes.
Virtual axis
A virtual axis exists in the positioning unit.
The existing axes (1st to 4th axes) can be used effectively if the virtual axis is used.
The virtual axis cannot output pulses externally.
The virtual axis cannot receive any external input signals, either.
Pulse input
The master axis operates according to pulse value input into the positioning unit.
Use pulse input in the case of connecting an external device, such as an encoder, for the
reference of synchronous control.
In the case of using pulse input as the master axis, the slave axes will operate according to
the pulse input. Therefore, be careful when starting or stopping the operation of the positioning
unit.
Types and restrictions of master axis
Type
Existing axis Virtual axis Pulse input
Home return m
Available to data setting
only.
No
JOG operation Yes Yes No
Positioning
Single axis Yes Yes No
Interpolation Yes
No
Available to single axis
only.
No
Stop
functions
System/Emergency/
Deceleration stop
Yes Yes No
Limit stop Yes
Questionable
Stops only with software
limit because of no limit
signal input.
No
Error stop Yes Yes No
Others
Necessary to make
settings to use the virtual
axis on the Configuration
screen.
Synchronizes with
external pulse input,
and no master axis
control is possible.
To stop synchronous
control, stop the slave
axes.
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