Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 71)

Advanced Instruction Set
Chapter 6
6Ć14
Section C
Jump Instructions and Subroutine Programming
You are capable of reducing scan time by using instructions that selectively
jump over portions of a program. These instructions are:
Jump
Label
Jump to subroutine
Return
This section describes how jump instructions and subroutine programming
direct the path of the program scan through the main program and the
subroutine area.
The subroutine area is located in the memory between the main program and the
message store areas (Figure 6.7). This area acts as the end of program
statement for the main program. It allows storage of small programs that are to
be accessed periodically. Subroutine areas are not scanned unless you program
the processor to jump to this area.
Introduction
What is a Subroutine Area?