Hitachi CP-X200 instruction manual Operationsand

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Operationsand	Operationsand	Monitoring
	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	*	PCS	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 = [PCS] – [L]

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

X200

		24V
Input common
		+
		-
	Input
	circuits