Hitachi X200 Series instruction manual Sinking Inputs, External Supply

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Operations and Monitoring

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					X200
				P24
Field device						24V
	*	24V	*	PLC	Input common	+
+	24V		+			-
-			-
	GND		Logic GND	L
	1			1
					Input
					circuits
	5			5
			Input switches
Open collector outputs,		* Note: If the external power supply to GND is (optionally)
		connected to [L], then install the above diode.
NPN transistors

Sourcing Inputs, External Supply

Short bar = [PLC] – [L]

		Short bar
PNP transistor
sousing outputs			P24
		24V
Field device
		+	PLC
		-
			L
		1	1
		5	5
+	24V	Input switches
-		GND

X200

Input common	24V
	+
	-

Input circuits