Omron CP1L Operation Manual page 148

Wiring CP1L CPU Units
Connecting I/O
Devices
DC Input Devices
Contact output
NPN open-collector output
+
Sensor
power supply
Output
5 mA/
7 mA
0 V
PNP current output
+
Sensor
power supply
Output
5 mA/
7 mA
0 V
Precautions when
Connecting a Two-wire DC
Sensor
114
Use the following information for reference when selecting or connecting input
devices.
Connectable DC Input Devices (for DC Output Models)
IN
CP1L
COM
CP1L
IN
COM +
IN CP1L
COM
• The circuit below should not be used for I/O devices with a voltage output.
When using a two-wire sensor with a 24-V DC input device, check that the fol-
lowing conditions have been met. Failure to meet these conditions may result
in operating errors.
1,2,3... 1. Relation between voltage when the PLC is ON and the sensor residual
voltage:
≤ V
V
ON
2. Relation between current when the PLC is ON and sensor control output
(load current):
(min) ≤ I
I
OUT
I = (V
ON
When I
bleeder resistor constant can be calculated as follows:
R ≤ (V
Power W ≥ (V
Two-wire DC output
NPN current output
Current
regulator
Voltage output
Sensor
+
power supply
Output
0 V
− V
CC R
≤ I
(max)
ON OUT
− V − 1.5 [PLC internal residual voltage]*)/R
CC R
is smaller than I
ON OUT
− V (min) − I
)/(I
CC R OUT
− V 2 /R × 4 [allowable margin]
)
CC R
+
Sensor
power supply
+
Output
5 mA/
+
7 mA
Sensor
power supply
0 V
+
Output
0 V
Sensor
power supply
CP1L
IN
−
COM
(min), connect a bleeder resistor R. The
)
ON
Section 3-4
IN
CP1L
COM +
CP1L
IN
COM ⊕
COM +
CP1L
IN
IN