
B–62073E–1/04 2. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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The following time chart shows the above sequence:
Time chart for exiting the spindle positioning mode and entering the spindle turning mode
(1) (2) (3) (4) (5) (6) (7) (8)
M command ( independent ) Mzz
Strobe signal MF
Spindle stop check signal SPSTP
Spindle position control
Spindle position control servo-ON
Spindle unclamp signal SUCLP
Spindle unclamp completion signal *SEUCL
Auxiliary function completion signal FIN
NOTE 1 Automatic operation stop signal *SP is disabled when operations are executed for exiting the
spindle turning mode and entering the spindle positioning mode (Mxx command), positioning
the spindle in the spindle positioning mode (Myy to Myy+5 commands and C command), or
exiting the spindle positioning mode and entering the spindle turning mode (Mzz command).
Automatic operation is not stopped until each of the above operations is completed even if the
*SP signal is turned off.
NOTE 2 Dry run signal DRN and machine lock signal MLK are invalid for spindle positioning.
NOTE 3 Miscellaneous function lock signal AFL is invalid for spindle positioning with an M command
(Mxx command, Myy to Myy+5 commands, and Mzz command).
(a) Spindle gear selection signals (GS1, GS2, GS4)
[Classification]
Input signals
[Function] These signals notify the control unit of the state of the gear between the spindle motor and
spindle. The gear ratio itself is not input; the currently selected gear among the several steps
of gear provided on the machine is input in binary.
GS4 GS2 GS1 Gear selection
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1st step
2nd step
3rd step
4th step
5th step
6th step
7th step
8th step
The mode of the spindle control unit is changed from spindle control to position control in order
to exit the spindle turning mode and enter the spindle positioning mode. In position control,
the specified angle by which to turn the spindle is input to the error counter and converted to
a speed command to the motor. The factor for the conversion (loop gain multiplier) differs
depending on the gear ratio between the spindle motor and spindle. The loop gain multiplier
for the gear currently selected is set in the position control circuit based on the gear selection
signals. Set the loop gain multiplier for each gear in a parameter beforehand.
When the serial interface spindle is used, up to four steps of gear can be used. (See the sub-
sections on spindle serial output and Cs contour control function for details.)