6. INTERPOLATION FUNCTION
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500
When a G51.2 is issued to put the system in the polygon synchronization
mode, the polygon synchronization under way signal PSYN<F063#7>
becomes on.
Set up a PMC sequence for the polygon synchronization mode by
monitoring this signal with a PMC ladder.
There are two control methods, (A) and (B), to control energizing of the
spindle. First select (A) or (B) and creates a PMC sequence according to
the selected method.
Method A
(A)Energize the first and second spindles automatically during the G51.2
mode.
Basically, do not discontinue energizing during this mode.
In this case, keep bit 7 (PST) of parameter No. 7603 = 0.
In the PMC sequence, detect when the polygon synchronization
under way signal PSYN<F063#7> changes from 0 to 1, then
energize the first and second spindles.
The NC stops at the G51.2 command block which puts the system
in the polygon synchronization mode, and remains there until the
spindle reaches the polygon synchronization speed.
Also, keep the spindle energized, for example, by preventing it
from receiving a spindle stop command (like M05) for ordinary
spindle control while PSYN<F063#7> = 1. Basically, deenergize
the spindle when the polygon synchronization under way signal
PSYN<F063#7> changes from 1 to 0.
Method B
(B)Control the energizing of the spindle using M codes even during the
G51.2 mode. Alternatively, deenergize the spindle even during the
G51.2
In this case, keep bit 7 (PST) of parameter No. 7603 = 1.
This parameter setting enables use of the spindle stop signal
*PLSST<G038#0> during the polygon synchronization mode. It
also makes the G51.2 command block stop waiting for the spindle
to reach the polygon synchronization speed.
In the PMC sequence, while the polygon synchronization under
way signal PSYN<F063#7> = 1, set *PLSST<G038#0> to 1 after
confirming both first spindle and second spindles are energized.
If either spindle has been deenergized, reset *PLSST<G038#0> to
0.
When the polygon synchronization under way signal PSYN
<F063#7> changes from 1 to 0, basically keep *PLSST <G038#0>
at 0. (This is intended to keep *PLSST <G038#0> from becoming
1 in a deenergized state when the polygon synchronization mode
is entered again.)
When *PLSST <G038#0> changes from 0 to 1 during the polygon
synchronization mode, the spindle is accelerated from a stop state
to the specified speed and placed under phase control, even if the
S command has not been changed.
D PMC sequence