
B-63942EN/02 NC FUNCTION 1.CONTROLLED AXIS
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1.14 AXIS SYNCHRONOUS CONTROL
When a movement is made along one axis by using two servo motors
as in the case of a large gantry machine, a command for one axis can
drive the two motors by synchronizing one motor with the other.
Moreover, by using a feedback signal from each motor, a positional
difference (synchronous error) between the two motors is detected to
compensate for the synchronous error. When a synchronous error
exceeding a set value occurs, a synchronous error check can be made
to issue an alarm and stop a movement along the axis.
An axis used as the reference for axis synchronous control is referred
to as a master axis (M-axis), and an axis along which a movement is
made in synchronism with the master axis is referred to as a slave axis
(S-axis).
Z
(Slave axis)
(Master axis)
Even when synchronous error compensation is not used, the
synchronous establishment function can be used for automatic
compensation to eliminate a machine coordinate error in cases such as
emergency stop cancellation.
An external signal can be used to turn synchronization on and off.
When synchronization is turned on and off using an external signal,
synchronous error compensation cannot be used.