SMC Networks LECYU Series, Operation Manual

Page: 76 / 250

3 Wiring and Connection
3-22
3.4 Examples of Connection to PC or PLC...etc
This section shows examples of DRIVER I/O signal connection to the PC or PLC...etc.
3.4.1 Sequence Input Circuit
(1) Photocoupler Input Circuit
CN1 connector terminals 6 to 13 are explained 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.
Relay Circuit Example Open-collector Circuit Example
24 VDC
DRIVER
+24 VIN 3.3 k
Ω
/DEC, etc.
24 VDC
DRIVER
+24 VIN 3.3 k
Ω
/DEC, etc.
Note: The 24 VDC external power supply capacity must be 50 mA minimum.
The DRIVER’s input circuit uses bidirectional photocoupler. Select either the sink circuit or the source circuit
according to the specifications required for each machine.
Note: - The connection example in 3.2.3 shows sink circuits.
- The ON/OFF polarity differs between when a sink circuit is connected and when a source circuit is connected.
Sink Circuit Source Circuit
24 V
+
−
DRIVER input
24 V
+
− DRIVER input
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