4.5 I/O Signal Connections
4.5.4 I/O Circuits
4-40
Photocoupler Output Circuits
Photocoupler output circuits are used for the ALM (Servo Alarm), /S-RDY (Servo Ready), and
other sequence output signals. Connect a photocoupler output circuit to a relay or line-receiver
circuit.
Note: The maximum allowable voltage and current range for photocoupler output circuits are as follows:
• Maximum allowable voltage: 30 VDC
• Current range: 5 mA to 50 mA DC
Line-Driver Output Circuits
This section describes CN1 connector pins 33-34 (Phase-A Signal), 35-36 (Phase-B Signal),
19-20 (Phase-C Signal) and 48-49 (Phase-S Signal).
The serial data from the encoder is converted to two-phase (phases A and B) pulses. The
resulting output signals (PAO, /PAO and PBO, /PBO), origin pulse signal (PCO and /PCO), and
the absolute encoder position output signals (PSO and /PSO) are output with line-driver output
circuits. Connect the line-driver output circuits to line-receiver circuits at the host controller.
Example for Relay Circuit Example for Line-Receiver Circuit
Example for Line-Receiver Circuit
0V
Relay
5 VDC to 30 VDC
SERVOPACK
Applicable line receiver:
SN75ALS175 or MC3486
manufactured by Texas Instruments
or the equivalent
Output line driver:
SN75ALS174 or
the equivalent
Host controller
SERVOPACK
220 Ω to
470 Ω
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