Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual - Manual (Page 73)

Introduction to Programming
Chapter 4
4Ć9
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
|ą|
11
(ą)
00
111 010
|ą|
12
111
Two
Branch
Start
Instructions
A Single
Branch End
Instruction
Two Possible Paths for
Logic Continuity (ORĆLogic)
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