
B--63003EN--1/02
16. INTERFACES RELATED TO Series 20i MACRO
1281
Timing of signals for specifying feed per minute and feed per revolution
The following descriptions use the timing chart shown below as an
example.
Feed--per --minute/--revolution
button
(2)
(3)
(4)
(5)
(3)
(4)
(1)
G98/G99; executed
FMIN/FREV
(feed per minute/revolution)
(PMC→MACRO)
SSCE (feed per minute/
revolution completion)
(MACRO→PMC)
GST (guidance start)
(MACRO→PMC)
Mode
(PMC→NC)
ST (start signal)
(PMC→NC)
M02 (machining end)
(NC→PMC)
ERS (external reset)
(PMC→NC)
RST (reset in progress)
(NC→PMC)
(1)When the feed--per--minute/--revolution button is pressed, the PMC
sets the FMIN/FREV signal to 1 to request MACRO to make
preparation for feed--per--minute/--revolution mode switching.
(2)When the FMIN/FREV signal becomes 1, MACRO sets the SSCE and
GST signals to 1. When the SSCE signal becomes 1, the PMC resets
the FMIN/FREV signal to 0. When the FMIN/FREV signal becomes
0, MACRO resets the SSCE signal to 0 to deselect the
feed--per--minute/--revolution feed mode.
(3)When the GST signal becomes 1, the PMC enters the MEM mode and
turns on the start signal ST, thus causing the
feed--per--minute/--revolution command (G98/G99;) to be executed.
(4)When the feed--per--minute/--revolution command ends, the NC
outputs M02, causing the PMC to reset the external reset signal ERS
to 0 for causing a reset.
(5)When a reset occurs, the PMC returns from the MEM mode to the
previous mode, and MACRO resets the GST signal to 0.