Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 112)

Chapter 6
Programming Overview
6–15
Nested branching can be converted into non-nested branches by repeating
instructions to make parallel equivalents.
Example – Non-Nested Equivalent
Nested branch
Non-nested equivalent
parallel branch
a b c f
d
e
a b C f
d
e
c
Understanding Instruction List Programs
Instruction list (Boolean) programming uses mnemonics to represent all the
functions and connections available in a ladder logic instruction set.
Mnemonics are instructions written in abbreviated form, using two or three
letters that imply the operation of the instruction, such as LD, AND, and
OUT.
LD I/0
AND I/1
OUT O/1
input instructions
output instruction
}
The MicroLogix 1000 HHP allows you to enter an instruction list program
when programming the micro controller.