4.5 I/O Signal Connections
4.5.4 I/O Circuits
4-37
4
W
iring and Connecting
S
ER
VOP
ACK
s
4.5.4
I/O Circuits
Reference Input Circuits
Analog Input Circuits
This section describes CN1 connector terminals 5-6 (Speed Reference Input) and 9-10 (Torque
Reference Input).
The analog signals are used as either speed or torque reference signals. The input impedance
is as follows:
•
Speed Reference Input: Approx. 14 k
Ω
•
Torque Reference Input: Approx. 14 k
Ω
The maximum allowable voltage for input signals is
±
12 V.
Position Reference Input Circuits
This section describes CN1 connector terminals 7-8 (Reference Pulse Input), 11-12 (Reference
Sign Input), and 15-14 (Clear Input).
The output circuits for the reference pulses and Position Deviation Clear signal from the host
controller can be either line-driver outputs or open-collector outputs. The following diagrams
show these by output type.
Analog Voltage Input Circuit
(Example for D/A)
Analog Voltage Input Circuit
(Wiring Example for Forward Operation)
Line-Driver Output Circuit
Open-Collector Output Circuits
(12-V Power Supply in SERVOPACK)
0 V
S
G
Approx. 14 k
Ω
min.
S
ERVOPACK
V-REF or T-REF
Ho
s
t controller
D/A
1.8 k
Ω
(1/2 W) min.
25HP-10B
2 k
Ω
12 V
0 V
S
G
Approx. 14 k
Ω
min.
S
ERVOPACK
V-REF or T-REF
150
Ω
4.7 k
Ω
Applicable Line Driver:
S
N75AL
S
174 from Texa
s
In
s
trument
s
or equivalent
Ho
s
t controller
S
ERVOPACK
2.8 V ≤ (High level − Low level) ≤
3
.7 V
If the above formula i
s
not
s
ati
s
fied, the input
s
to the
S
ERVOPACK will be un
s
table. Pul
s
e
s
may be mi
ss
ed from
the Reference Pul
s
e Input, reference inver
s
ion may occur
for the Reference
S
ign Input, and the Clear
s
ignal may turn
OFF for the Clear
s
ignal input.
S
ERVOPACK
Ho
s
t controller
PL1, PL2, or PL
3
terminal
0 V
+12 V
4.7 k
Ω
150
Ω
ON:
1.5 V max.
Approx.
9 mA