4.5 I/O Signal Connections
4.5.4 I/O Circuits
4-38
Sequence Input Circuits
Photocoupler Input Circuits
This section describes CN1 connector terminals 40 to 47. The circuits are connected through
relay or open-collector transistor circuits. If you connect through a relay, use a low-current
relay. If you do not use a low-current relay, a faulty contact may result.
Note: The 24-VDC external power supply capacity must be 50 mA minimum.
The SERVOPACK input circuits use bidirectional photocouplers. Select either a sink circuit or
source circuit according to the specifications required by the machine.
Note: The connection examples in 4.5.3 I/O Signal Wiring Examples on page 4-31 are for sink circuit connections.
• Precaution When Host Controller Uses Open-Collector Output with User-Supplied Power Sup-
ply
The SERVOPACK may fail depending on the relationship between the pull-up voltage (Vcc) and
the pull-up resistance (R1). Before you wire the circuits, confirm that the specifications of the
host controller satisfy the values shown in the following table.
Examples for Relay Circuits Examples for Open-Collector Circuits
Refer to the following section for the interface for the SEN signal input circuit.
6.12.2 Structure of the Position Data of the Absolute Encoder on page 6-71
Pull-Up Voltage (Vcc) Pull-Up Resistance (R1)
24 V 1.8 kΩ to 2.7 kΩ
12 V max. 820 Ω to 1.5 kΩ
5 V max. 180 Ω to 470 Ω
Circuit Example for Open-Collector Outputs
SERVOPACK
VF = 1.5 V to 1.8 V
Vcc
Tr 1
V
F
R1
i
Host controller
150 Ω
4.7 kΩ
Pull-up
4.7 kΩ
E.g., /S-ON
SERVOPACK
24 VDC
+24VIN
24 VDC
4.7 kΩ
E.g., /S-ON
SERVOPACK
+24VIN
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