Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 305)

16 Chapter
16–1
Instruction List Programming
This chapter uses programming examples to teach you instruction list
programming. The chapter also lists programming considerations.
In the section Applying Logic to Your Schematics, page 6–11, you learned
the concepts behind ladder logic. You were also shown the instruction list
(Boolean) equivalent of a simple rung of logic. This section builds on that
by showing you some more rung examples and their equivalent instruction
list(s).
Important: Although the rung examples shown here use only bit
instructions, you can apply the methodology that is shown to
any of the instructions you learned about in chapters 8–14.
Because of the flexibility of instruction list programming, there is often more
than one instruction list representation possible for the same rung. However,
there is always one representation that is considered to be the most
optimized. This is the shortest list representation possible for the rung.
Important: For instruction list programming, you must begin every rung by
pressing the key shown here:
NEW
RUNG
T
To help you remember to do this, each instruction list example
in this chapter begins with the words
NEW RUNG . (See page
17–2 for more information.)
Input Rung Examples
Examples of input rungs and their optimized instruction list representation
are provided below. Since many of these rungs have more than one possible
instruction list representation, optional representations are shown to the right
of the optimized list.
Series Inputs
This example shows the instruction list for a simple series connection.
a b c
NEW RUNG
LD a
AND b
OUT c
Optimized
NEW RUNG
LD a
LD b
ANB
OUT c
Option 1
Programming Examples