3.4 Examples of Connection to Host Controller3-233 Wiring and Connection3.4.2 Sequence Input Circuit(1) Photocoupler Input CircuitCN1 connector terminals 12, 14 to 18, 25, 26 are explained below.The sequence input circuit interface is connected through a relay or open-collector transistor circuit. Whenconnecting through a relay, use a low-current relay. If a low-current relay is not used, a faulty contact mayresult.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 sourcecircuit according to the specifications required for each machine.Note: • The connection examples in 3.2.2 to 3.2.4 show sink circuits.• 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 ExampleSink Circuit Source CircuitInput Signal Polarities Input Signal PolaritiesSignal Level VoltageLevel Contact Signal Level VoltageLevel ContactON Low (L)level 0 V Close ON High (H)level 24 V CloseOFF High (H)level 24 V Open OFF Low (L)level 0 V Open3.3 kΩ/S-ON, etc.SERVOPACK24 VDC +24 VIN 24 VDC 3.3 kΩ/S-ON, etc.SERVOPACK+24 VIN24 V+ − SERVOPACK input 24 V+ − SERVOPACK input
