21. AXIS CONTROL FUNCTIONS
It is possible to change the operating mode for two or more specified axes
to either synchronous operation or normal operation by an input signal
from the machine.
The following operating modes are applicable to machines having two
tables driven independently by separate control axes. The following
example is of a machine with two tables driven independently by the Y
axis and V axis. If he axis names are different, substitute a suitable name
for the ones below.
Fig. 21(a) Example of axis configuration of the machine
by simple synchronous control
This mode is used for machining large workpieces that extend over two
While operating one axis with a move command, it is possible to
synchronously move the other axis. In the synchronous mode, the axis
to which the move command applies is called the master axis, and the axis
that moves synchronously with the master axis is called the slave axis.
In this example, it is assumed that Y axis is the master axis and V axis is
the slave axis. Here, the Y axis and the V axis move synchronously in
accordance with program command Yyyyy issued to the Y axis (master
Synchronous operation here means that the move command for the master
axis is issued simultaneously to both the servo motor for the master axis
and that for the slave axis. In synchronous operation, the servo motor for
the slave axis is not compensated for the deviation which is always
detected between the two servo motors.
Deviation alarms are also not detected. Synchronous operation is
possible during automatic operation, jog feed, manual handle feed using
the manual pulse generator, and incremental feed, but is not possible
during manual reference position return.
D Synchronous operation