
B–62073E–1/042. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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(d) Spindle motor command voltage signals (RISGN [#1, #2], RI0 to RI12 [#1, #2])
[Classification]
Input signals
[Function] These signals specify an output voltage for the spindle motor. The control unit controls a spe-
cified voltage to be output to the spindle motor by using these input signals only, regardless
of an output command spindle signal. The PMC may output, as these signals, a value calcu-
lated according to a selected gear from a received command spindle speed. The PMC may
also output a different speed (for example, a speed for spindle orientation).
These signals consist of the sign signal RISGN for determining the voltage polarity, and 13
binary signals, RI0 to RI12, for determining an absolute voltage value.
A positive (+) voltage is output when RISGN is low.
A negative (–) voltage is output when RISGN is high.
The 13 binary signals are related to an output voltage as follows:
Command voltage
12
i0
(2
i
Vi)
E
8191
volt
whereVi = 0 when RIi is low
Vi = 1 when RIi is high
E represents a maximum voltage dependent on hardware.
[Operation] The control unit outputs the value of these input signals to the D/A converter every 16 msec.
(e) Spindle alarm code signals (SPAL1, SPAL2, SPAL4, and SPAL8 [#1, #2])
[Classification]
Output signals
[Function] These signals report the details of an alarm raised in the spindle speed control unit. The
spindle alarm signal available on the FANUC spindle speed control unit must be connected
to the control unit.
The table below explains the meanings of spindle alarm code signals SPAL to SPAL8 and
alarms.
SPAL
8
SPAL
4
SPAL
2
SPAL
1
Meaning
1 0 0 0 1 Spindle motor overheat
2 0 0 1 0 Spindle speed deviation excessive
3 0 0 1 1 Blown fuse at DC power unit
4 0 1 0 0 Blown fuse at AC input
5 0 1 0 1 Blown fuse at control power input
6 0 1 1 0
Spindle motor overspeed (analog
detection)
7 0 1 1 1
Spindle motor overspeed (digital
detection)
8 1 0 0 0 Overvoltage
9 1 0 0 1 Overheat at main circuit
10 1 0 1 0 Overvoltage at DC power unit
11 1 0 1 1 Control voltage drop
12 1 1 0 0 Excessive circuit current
13 1 1 0 1 Abnormal computing circuit
14 1 1 1 0 Abnormal control ROM
15 1 1 1 1 – – –
(0: Signal LOW 1: Signal HIGH)