Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Creating a PLC Ladder Program

DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming

Ladder Diagram		Explanation	Instruction	Available Devices
	Structure
		Multiple output branches	MPS
			MRD	None
			MPP
		Output coil	OUT	Y, M, S
	S	Step ladder	STL	S
		Basic / Application		Basic instructions and API
			-	instructions. Please refer to
		instruction
				chapter 3 Instruction Set
		Inverse logic	INV	None

1.5.1 Creating a PLC Ladder Program

The editing of the program should start from the left side bus line to the right side bus line, and from up to down. However, the right side bus line is omitted when editing in WPLSoft. A single row can have maximum 11 contacts on it. If more than 11 contacts are connected, a continuous symbol “0” will be generated automatically and the 12th contact will be placed at the start of next row. The same input points can be used repeatedly. See the figure below:

X0 X1 X2 X3 X4 X5 X6 X7 X10 C0 C1

0

X11 X12 X13

0 Y1

When evaluating the user program, PLC scan starts from left to right and proceeds to next row down until the PLC reaches END instruction. Output coils and basic / application instructions belong to the output process and are placed at the right of ladder diagram. The sample program below explains the execution order of a ladder diagram. The numbers in the black circles indicate the execution order.

X0 X1

M0

X3 M1

Y1 X4

T0 M3

Y1

TMR T0 K10

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