Wiring
3.4.4 Interface Circuits
3 -24
3.4.4 Interface Circuits
This section shows examples of Servopack I/O signal connection to the host controller.
J
J
Interface for Reference Input Circuits
Analog Input Circuit
Analog signals are either speed or torque reference signals at the impedance below.
D
Reference speed input: About 14 k
W
D
Reference torque input: About 14 k
W
The maximum allowable voltages for input signals is
±
12 V.
12V
1.8 k
W
(1/2 W) min.
25-HP-10B
2 k
W
3
1
2
1000:1
0V
SG
About 14 k
W
Servopack
V-REF or
T-REF
Reference Position Input Circuit
An output circuit for the reference pulse and error counter clear signal at the host controller can
be either line-driver or open-collector outputs. These are shown below by type.
D
Line-driver Output
2.8 V
(H level) -- (L level)
3.7 V
150
W
4.7 k
W
Applicable line-driver
SN75174 manufactured by
T/I or the equivalent
Servopack end
Host
controller end
D
Open-collector Output, Example 1: Power Supply Provided by User
V
F
= 1.5 to 1.8 V
Vcc
Tr1
V
F
R1
i
150
W
4.7 k
W
Servopack end
Host
controller end
Use the examples below to set pull-up resistor R1 so the input current, i, falls between 7 and
15 mA.
Application Examples
R1 = 2.2 k
W
with a V
CC
of
24 V
±
5%
R1 = 1 k
W
with a V
CC
of 12 V
±
5%
R1 = 180
W
with a V
CC
of 5 V
±
5%
3
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