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Sigma II User's Manual
The following examples show how to select the pull-up resistor R1 so the input cur-
rent, I, falls between 7 and 15mA.
R1 = 2.2kΩ with
V
CC
•
Open-Collector Output, Example 2: Using a servo amplifier with an internal
12V power supply
This circuit uses the 12V power supply built into the servo amplifier. The input
is not isolated in this case.
n
Sequence Input Circuit Interface
The sequence input circuit interface connects through a relay or open-collector tran-
sistor circuit. Select a low-current relay otherwise a faulty contact will result.
24V
DC
50mA minimum
n
Output Circuit Interfaces
Any of the following three types of servo amplifier output circuits can be used. Con-
nect an input circuit at the host controller following one of these types.
•
Connecting to a Line-driver Output Circuit
Encoder serial data converted to two-phase (A and B phase) pulse output signals
(PAO, /PAO, PBO, /PBO), origin pulse signals (PCO, /PCO) and S phase rota-
tion signals (PCO, /PCO) are output via line-driver output circuits that normally
comprise the position control system at the host controller. Connect the line-
driver output circuit through a line receiver circuit at the host controller.
Application Examples
R1 = 1kΩ with
= 24V ±5%
V
= 12V ±5%
CC
Host
controller end
About
9mA
1.5V maximum
when ON
Servo amplifier
3.3kΩ
24V
IN
/S-ON, etc.
R1 = 180Ω with
V
= 5V ±5%
CC
3.3kΩ
150Ω
Servo amplifier end
PL1, PL2, PL3 terminals
1.0kΩ
150Ω
V
24V
DC
24V
50mA minimum
/S-ON, etc.
3-18
Chapter 3: Wiring
Servo amplifier
3.3kΩ
IN
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