5-4-9
Wiring the built-in I/O
This section gives some wiring examples for the built-in I/O and precautions for wiring.
Wiring the Built-in Input
Use the following information for reference when selecting or connecting input devices.
l
DC Input Devices Which Can Be Connected (DC Output)
0 V
+
0 V
+
+
IN
0 V
+
COM
IN
IN
0 V
+
COM
COM
0 V
+
+
ININ
COM
COM
+
IN
COM
+
IN
COM
Input terminal
block
Input terminal
block
Input terminal
block
Input terminal
block
Input terminal
block
Input terminal
block
Input terminal
block
Sensor
Power
supply
Output
• The circuit below should not be used for I/O devices having a voltage output.
Voltage output
Sensor
Power
supply
Output
Sensor
Power
supply
Output
Output
NPN open-collector output
Contact output
Sensor
Power
supply
Two-wire DC output
NPN current output
Current
regulator
Sensor
Power
supply
PNP current output
Output
Sensor
Power
supply
l
Precautions When Connecting a Two-wire DC Sensor
When a two-wire sensor is used with a DC input, check that the following conditions are met. Fail-
ure to meet these conditions may result in operating errors.
(a) Relation between ON voltage of the DC input and sensor residual voltage
V
ON
≤ V
CC
− V
R
(b) Relation between input current to the DC input and sensor control output (load current)
I
OUT
(min) ≤ I
ON
≤ I
OUT
(max)
5 Installation and Wiring
5-65
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
5-4 Wiring
5
5-4-9 Wiring the built-in I/O
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