Hitachi WJ200-001S Instruction Manual page 221

414
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
jumper wire, and use a diode (*) with the external supply. This will prevent a power
supply contention in case the jumper wire is accidentally placed in the incorrect
position. For the "Sourcing Inputs, External Supply", please connect the jumper wire as
drawn in the diagram below.
Sinking Inputs, External Supply
Jumper wire = Removed
Field device
+
24V
-
Open collector outputs,
NPN transistors
Sourcing Inputs, External Supply
Jumper wire = Removed
PNP transistor
sourcing outputs
Field device
+
24V
-
*
24V
+
-
GND
1
7
Input switches
* Note: If the external power supply to GND is (optionally)
connected to [L], then install the above diode.
1
7
Input switches
GND
P24
*
Input common
PLC
Logic GND
L
1
Input
circuits
7
24V
P24
+
-
Input common
PLC
L
1
Input
circuits
7
WJ200
24V
+
-
WJ200
24V
+
-