
B–62073E–1/04 2. INTERFACE BETWEEN CNC AND PMC–NA OR NB
– 205 –
NOTE These signals are not provided in the FS3/6 interface.
(g) Spindle contour control mode switch signals (SCNTR1, SCNTR2, SCNTR3, ...)
[Classification]
Input signals
[Function] [Function] Used in switching between the spindle rotation control mode and the spindle con-
tour control mode. One signal is available for each controlled axis. The last digit in the signal
name indicates the number of a controlled axis. It is necessary to use the signal with the con-
trolled axis number corresponding to the spindle contour control axis.
SCNTR1
1 ……1st axis
2 ……2nd axis
3 ……3rd axis
:
:
:
:
[Operation] When the signal is low, the machine tool enters the spindle contour control mode. When the
signal is high it enters the spindle rotation control mode. Before switching from spindle con-
tour control to spindle rotation control, it is necessary to ensure that the spindle move com-
mand is complete. Switching from spindle rotation control to spindle contour control is pos-
sible while the spindle is rotating.
NOTE These signals are not provided in the FS3/6 interface.
Spindle speed control
Spindol contour control
Spindle speed control
SCNTRi
MSCNTRi
Internal control switching
High
Low
High
Internal control switching
Fig. 2.3.33 Control mode switch signals
(h) Signals for specifying the voltage output to the spindle motor (RISGN, RISGNB, RI0 to RI12, RIB0 to
RIB12)
[Classification]
Input signals
[Function] Specify the output voltage for the spindle motor. The control unit controls the voltage output
to the spindle motor using these signals, only regardless of the spindle rotation speed speci-
fied in the output command. The PM C uses these signals for specifying the voltage after cal-
culating it from the received spindle rotation speed according to the selected gear, or for spec-
ifying the voltage for other purposes (for example, for spindle orienta tion).
The signals include the polarity signal, RISGN, which specifies the polarity of the voltage, and
13–bit binary code signals, RI0 to RI12, which specify the absolute value of the voltage.
A positive voltage is output when RISGN is low and a negative voltage is output when RISGN
is high.
The output voltage is calculated from the 13–bit binary code signals –– using the following
formula: