Omron MX2 - Sinking Inputs, External Supply Diagram; Sourcing Inputs, External Supply Diagram

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Using Intelligent Input Terminals Section 4-5
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
GND
7
1
Field device
Open collector outputs,
NPN transistors
MX2
P24
1
7
24 V
PLC
Input
circuits
+
-
Logic GND
Input common
Input switches
L
24 V
+
-
+
-
24 V
**
* Note: If the external power supply to GND is (optionally)
connected to [L], then install the above diode.
Sourcing Inputs, External Supply
Short bar = [PLC] – [L]
7
1
Field device
MX2
P24
1
7
24 V
PLC
Input
circuits
+
-
Input common
Input switches
L
GND
PNP transistor
sourcing outputs
24 V
+
-
24 V
+
-
Short bar