Virtual Drive Axis; Virtual Linked Axis - Mitsubishi Electric MELSEC iQ-R Series User Manual

Virtual drive axis

This axis can generate commands virtually in the motion system. A real drive unit is not used. The available commands/
functions are partly different from those of the real axis.
Since the virtual drive axis is specialized for generating the position command and it does not simulate a
situation that the drive unit is connected, available functions are restricted. For simulating the operation close
to the state when the drive unit is connected, use the slave emulate function to the real axis drive. For details,
refer to the following.
Page 370 Slave Emulate

Virtual linked axis

This axis connects FBs of single axis synchronous control. Since the minimum data for FB connection is defined, the
processing load is reduced compared to the FB connection using a virtual drive axis, etc.
Without axis assignment in the engineering tool, an axis can be temporarily generated during program execution by only
declaring the instance of the AXIS_REF structure in the local label. In this case, the motion system discards the axis data
generated temporarily when the PLC READY [Y0] is turned ON → OFF. (If axis assignment is executed in the engineering
tool, the axis data will be maintained even after the PLC READY [Y0] is turned ON → OFF.)
How to generate an axis
Set it according to axis assignment. For the method, refer to the following.
Page 41 Axis Assignment
Precautions
• Software stroke limit cannot be set in the virtual linked axis. When virtual linked axes are used to connect between each
user program of single axis synchronous control, set the software stroke limit in the end axis of connected single axis
synchronous control.
• When temporarily generated axis is started, it will take longer than the usual to start the axis because the axis variables are
generated in the service process.
1
1 AXIS SETTING
39
1.2 Axis Type