8. MULTI-PATH CONTROL
B-64693EN-1/01
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During composite control, the X2- and Z1-axes are moved by a path 1 program, and the workpiece
coordinates of the X-axis in path 1 indicates the position of turret 2. Similarly, the X1- and Z2-axes are
moved by a path 2 program, and the workpiece coordinates of the X-axis in path 2 indicates the position
of turret 1.
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Spindle control
The composite control function does not switch the spindle speed command or the feed per rotation
command based on feedback pulses from the position coder. Therefore, the spindle speed command and
feedback pulses should be switched using the spindle command selection signals and spindle feedback
selection signals.
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Tool offset during composite control
At the time of a switch between independent control and composite control, the preset offset value, tool
nose radius compensation/cutter compensation/tool length amounts will not be changed. After a control
switch, you must issue a new T/D/H code command to set an offset value again, if required.
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Reference position return during composite control
If G28 is issued to specify an automatic reference position return for an axis in one path during composite
control, an amount of movement is calculated so that the associated axis in the other path can move to the
reference position. In this case, the reference position for that axis must have already been established. If
the reference position of the axis of the other path subject to composite control has not been established,
alarm PS0359 “THE G28 WAS INSTRUCTED IN WITH THE REF POS NOT FIXED IN COMP
MODE” will result.
A manual reference position return is not allowed.
However, that during Cs axis composite control, a manual reference position return is allowed. If, after
the establishment of a reference position and before a switch to composite control, you want to enter the
state in which no reference position is established, set bit 5 (CRZ) of parameter No. 8161 to 1.
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Automatic workpiece coordinate system setting
By parameter setting, a workpiece coordinate system to be used during composite control can be
automatically set when composite control is started. When composite control is terminated, the workpiece
coordinate system can be automatically returned to the workpiece coordinate system used for ordinary
machining not under composite control.
A workpiece coordinate system to be used during composite control is explained below. For example,
when a movement is made on axes other than the specified axes by using composite control, it is
convenient to use a coordinate system that indicates the current position on the movement axes, as a
workpiece coordinate system for the specified axes. Such a workpiece coordinate system differs from the
original workpiece coordinate system for the specified axes, so that the coordinate system needs to be set
by programming when composite control is started. Moreover, the workpiece coordinate system needs to
be returned to the original workpiece coordinate system for the specified axes when composite control is
terminated. With this function, these coordinate systems can be set automatically.
Setting, command
When composite control is started, a workpiece coordinate system to be used during composite
control is automatically set for axes with bit 4 (MPMx) of parameter No. 8162 set to 1. When
composite control is terminated, the workpiece coordinate system can be automatically returned to
the workpiece coordinate system used for ordinary machining not under composite control in
connection with the axes with bit 5 (MPSx) of parameter No. 8162 set to 1.
To specify this function, the composite control axis change selection signals MIX1 to MIX32 are
used as in the case of ordinary composite control. When composite control is started by turning on
signals, a workpiece coordinate system for the composite axes is automatically set. Similarly, when
composite control is canceled by turning off signals, a workpiece coordinate system for the
composite axes is automatically set.