Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Ladder Logic Symbols

1. PLC Concepts

1.5Ladder Logic Symbols

The following table displays list of WPLSoft symbols their description, command, and memory registers that are able to use the symbol.

Ladder Diagram		Explanation	Instruction	Available Devices
	Structure
		NO (Normally Open)	LD	X, Y, M, S, T, C
		contact / A contact
		NC (Normally Closed)	LDI	X, Y, M, S, T, C
		contact / B contact
		NO contact in series	AND	X, Y, M, S, T, C
		NC contact in series	ANI	X, Y, M, S, T, C
		NO contact in parallel	OR	X, Y, M, S, T, C
		NC contact in parallel	ORI	X, Y, M, S, T, C
		Rising-edge trigger	LDP	X, Y, M, S, T, C
		switch
		Falling-edge trigger	LDF	X, Y, M, S, T, C
		switch
		Rising-edge trigger in	ANDP	X, Y, M, S, T, C
		series
		Falling-edge trigger in	ANDF	X, Y, M, S, T, C
		series
		Rising-edge trigger in	ORP	X, Y, M, S, T, C
		parallel
		Falling-edge trigger in	ORF	X, Y, M, S, T, C
		parallel
		Block in series	ANB	None
		Block in parallel	ORB	None

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