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6 Installation and Wiring
6.4.3 DC Input Modules
Input Device
Connection
Input Device
Connection
Input Device
Connection
Open collector output (V1 > V2)
Can be connected.
V1: Input signal power supply
V2: Input device power supply
Input device
V1
24 VDC
V2
12 VDC
Output with a diode (V1 > V2)
Cannot be connected.
V1: Input signal power supply
V2: Input device power supply
Input device
V1
24 VDC
V2
12 VDC
Output with a resistor and LED (V1 > V2)
Cannot be connected.
V1: Input signal power supply
V2: Input device power supply
Input device
V1
24 VDC
V2
12 VDC
The voltage resistance of the output transistor in the input
device must be 40 V or more.
DC Input Module
+Common 1
9
Input
When the input device is OFF, current indicated by the dot-
ted line in the figure on the left may flow, and the input may
not turn OFF.
DC Input Module
+Common 1
9
Input
When the input device is OFF, current indicated by the dot-
ted line in the figure on the left may flow and apply reverse
voltage to the LED, possibly damaging the LED.
DC Input Module
+Common 1
9
Input
6-44
Photocoupler
Photocoupler
Photocoupler
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