20. AXIS CONTROL FUNCTION
The synchronization control function enables the synchronization of
movements on two axes. If a move command is programmed for one of
those two axes (master axis), the function automatically issues the same
command to the other axis (slave axis), thus establishing synchronization
between the two axes. The parking state can be selected to suppress
movement of the slave axis, even if a move command is specified for the
master axis. If the parking state is used with the synchronization control
function, the operation can be controlled as follows:
1 Synchronizes the movement on the slave axis with that of the master
2 Performs slave axis movement according to the move command
programmed for the master axis. However, the movement specified
by the command is not made for the master axis itself (master parking).
3 Updates the slave axis coordinates according to the distance travelled
along the master axis. However, no movement is made for the slave
axis (slave parking).
When method 2 above is used, the following operation can be performed:
(Example) Synchronizing movements on the Z–axis and Y–axis
Movement is performed for the X–axis and Y–axis according to
commands issued for the X–axis and Z–axis. (The Y–axis movement is
synchronized with that of the Z–axis.) If the Z–axis is set to the parking
state, the coordinates on the Z–axis and Y–axis are updated.
As the coordinates on the Z–axis and Y–axis are always updated, the
coordinate system need not be reset when the synchronization status is
changed. A move command can be executed immediately after the status
1 In the synchronization control described above, an identical
move command is simultaneously output for two servo
processing systems. Positional error between the two servo
motors is not monitored, nor is either servo motor adjusted
to minimize the error. That is, synchronization error
compensation is not carried out.
2 The method used to specify the synchronization control
function varies with the machine tool builder. For details,
refer to the manual supplied by the machine tool builder.