5 Wiring and Connections
5.2.4 Sequence Input Circuit
5-14
5.2.4
Sequence Input Circuit
(1) Photocoupler Input Circuit
CN1 connector pin 2 is described below.
The sequence input circuit interface is connected through a relay or open-collector transistor circuit. When
connecting through a relay, use a low-current relay. If a low-current relay is not used, a faulty contact may
result.
Note: The 24 VDC external power supply capacity must be 50 mA minimum.
The SERVOPACK’s input circuit uses bidirectional photocoupler. Select either the sink circuit or the source
circuit according to the specifications required for each machine.
Note 1. The connection examples in
5.2.3 Example of I/O Signal Connections
use sinking circuits.
2. The ON/OFF polarity differs between when a sink circuit is connected and when a source circuit is connected.
Relay Circuit Example
Open-collector Circuit Example
Sink Circuit
Source Circuit
Input Signal Polarities
Input Signal Polarities
Signal
Level
Voltage
Level
Contact
Signal
Level
Voltage
Level
Contact
ON
Low (L)
level
0 V
Close
ON
High (H)
level
24 V
Close
OFF
High (H)
level
24 V
Open
OFF
Low (L)
level
0 V
Open
4.7 k
Ω
For example, /EXT
SERVOPACK
24 VDC
+24 VIN
24 VDC
4.7 k
Ω
For example, /EXT
SERVOPACK
+24 VIN
SERVOPACK input
24 V
+
−
SERVOPACK input
24 V
+
−
