
15. PMC CONTROL FUNCTION
B–63523EN–1/03
1836
NOTE
1 Specify a cutting feed command by the automatic operation
on the CNC side in the incremental mode.
2 If a signal is switched from 1 to 0 during superimposed
operation, alarm 130 will be raised. When setting a signal
to 0, do so after checking that the axial movement stops.
3 If the sum of the distribution amounts of the CNC and PMC
is too large when a CNC axis command and axial movement
by PMC axis control are superimposed, alarm 138 will be
raised.
If any of the following commands is specified while a program is being
executed, the command is executed before the superimposed command
from the PMC ends.
S Block of no movement (miscellaneous function, dwell, sequence
number, EOB, etc.)
S Cutting feed block
S Rapid traverse block which does not include the axis on which travel
by the superimposed command of PMC axis control is in progress
If any of the following commands is specified while a program is being
executed, the command is executed after the superimposed command
from the PMC ends.
S Rapid traverse block which includes the axis on which travel by the
superimposed command of PMC axis control is in progress
S Block of G05, G05.1, or G08
When any of the commands indicated above is specified, the block starts
after the travel as on the PMC axis ends. Rapid traverse and cutting feed
cannot be superimposed because many of their elements such as
acceleration/deceleration type and feed forward state cannot be executed
simultaneously. A block of G05, G05.1, or G08 cannot be executed in
succession because the feed forward state changes.
(1)The state of advance feed forward under superimposed control
depends on the state of the NC axis. Accordingly, G8C and G8R (bits
3 and 4 of parameter No.8004), which enable advanced preview
control for the PMC axis, are invalid.
(2)If travel on the NC axis is not in progress (reset state, halt state, etc.),
the feed forward state depends on the NC parameter settings.
If the superimposed command is executed in the reset state, for
instance, FFD (bit 1 of parameter No.2005) determines whether the
feed forward is enabled or disabled because the superimposed
command of the PMC axis is for cutting feed.
If the superimposed command is started while the automatic operation
is halted in the advanced preview control mode, the movement starts
in the advanced preview control mode.
D Commands that can be
executed in succession
during superimposed
operation
D Commands that cannot
be executed in
succession during
superimposed operation
Caution