Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Uživatelský manuál stáhnout pdf (Strana 73)

100

101

Introduction to Programming

Chapter 4

49

The branch instructions allow more than one combination of input

conditions to energize an output device (Figure 4.11).

These are two branch instructions:

Branch Start

Branch End

Figure 4.11

Branching

Instructions

||

()

111 010

||

111

Two

Branch

Start

Instructions

Single

Branch End

Instruction

wo Possible Paths for

Logic Continuity (ORLogic)

Branch Start

This instruction begins each parallel logic branch of a rung. The Branch

Start is programmed immediately before the first instruction of each

parallel logic path.

Branch End

This instruction completes a set of parallel branches. The Branch End is

entered after the last instruction of the last branch to end a set of parallel

branches.

Branch instructions must be entered in the correct order for proper logic

function. The only limitation is that a nested branch (a branch within a

branch) cannot be programmed directly (Figure 4.12).

4.3.3

Branch Instructions

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 345 346

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