YASKAWA SigmaLogic7 Compact Hardware Manual page 36

4 Inputs and Outputs
4.5.2 Digital Output Circuits
4.5.2 Digital Output Circuits
Incorrect wiring or incorrect voltage application to the output circuits
may cause short-circuit failures.
If a short-circuit failure occurs as a result of any of these causes, the
holding brake will not work. This could damage the machine or cause
Important
an accident that may result in death or injury.
 Photocoupler Output Circuits
Photocoupler output circuits are used for the ALM (Servo Alarm), /S-RDY (Servo
Ready), and other digital output signals. Connect a photocoupler output circuit to a
relay or line-receiver circuit.
Example for Relay Circuit
SERVOPACK
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 terminals 17-18 (Phase-A Signal), 19-20
(Phase-B Signal), and 21-22 (Phase-C 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) and origin pulse
signal (PCO and /PCO) are output with line-driver output circuits. Connect the line-
driver output circuits to line-receiver circuits at the host controller.
30
5 VDC to 30 VDC
Relay
0 V
Example for Line-Receiver Circuit
SERVOPACK
Output line driver:
SN75ALS174 or
the equivalent
Example for Line-Receiver Circuit
SERVOPACK
Host controller
Applicable line receiver:
SN75ALS175 or MC3486
manufactured by Texas Instruments
or the equivalent
220 Ω to
470 Ω
5 VDC to 30 VDC