Hitachi WJ200 Series Quick Reference Manual page 30

The two diagrams below show input wiring circuits using an external supply. If using the
"Sinking Inputs, External Supply" in below wiring diagram, be sure to remove the short bar,
and use a diode (*) with the external supply. This will prevent a power supply contention in
case the short bar is accidentally placed in the incorrect position. For the "Sourcing Inputs,
External Supply", please connect the short bar as drawn in the diagram below.
Sinking Inputs, External Supply
Short bar = Removed
Field device
+
24V
-
GND
1
7
Open collector outputs,
NPN transistors
Sourcing Inputs, External Supply
Short bar = [PLC] – [L]
PNP transistor
sourcing outputs
Field device
1
7
+
24V
-
GND
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*
P24
PLC
24V
+
-
Logic GND
L
1
7
Input switches
* Note: Make sure to remove the short circuit bar in case of
using an external power supply.
Short bar
P24
24V
PLC
+
-
L
1
7
Input switches
29
WJ200
24V
Input common
+
-
Input
circuits
WJ200
24V
Input common
+
-
Input
circuits