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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
5
1
Field device
Open collector outputs,
NPN transistors
X200
P24
1
5
24V
PCS
Input
circuits
+
-
Logic GND
Input common
Input switches
L
24V
+
-
+
-
24V
**
* Note: If the external power supply to GND is (optionally)
connected to [L], then install the above diode.
Sourcing Inputs, External Supply
Short bar = [PCS] – [L]
5
1
Field device
X200
P24
1
5
24V
PCS
Input
circuits
+
-
Input common
Input switches
L
GND
PNP transistor
sourcing outputs
24V
+
-
24V
+
-
Short bar
410
Operations and
Monitoring
4 10
Operations and
Monitoring