Sigma II User’s Manual Chapter 3: Wiring
3 - 21
3.4.4 Interface Circuits
This section shows examples of servo amplifier I/O signal connection to the host
controller.
Interface for Reference Input Circuits
Analog Input Circuit
Analog signals are either speed or torque reference signals at the impedance below.
• Speed reference input: About 14kΩ
• Torque reference input: About 14kΩ
The maximum allowable voltage for input signals is ±12V.
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.
• Line-driver Output Example:
• Open-collector Output, Example 1: External power supply
12V
25-HP-10B
3
1
2
1000:1
0V
SG
Servo Amplifier
V-REF or
T-REF
1.8kΩ (½W) minimum
2kΩ
About 14kΩ
Applicable line-driver
SN75174 manufactured by
TI, or the equivalent
Servo amplifier end
Host controller end
150Ω 4.7kΩ
2.8V ≤ (High level) - (Low level) ≤ 3.7V
VF = 1.5 to 1.8V
Tr1
R1
i
Servo amplifier end
Host
controller end
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