Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 113)

MicroLogix 1000 and PLC-500 A.I. Series Software Reference
5-8
Additional input logic instructions (conditions) can be programmed in the output
branches to further condition control of the outputs. When there is a true logic path,
including extra input conditions on an output branch, that branch becomes true.
] [
] [
( )
A C
B
Parallel Output Branching with Conditions
( ) ] [
D E
In the above example, either A and D, or B and D provide a true logical path to E.
Either A or B provide a true logical path to C.
Nested Branching
Input and output branches can be “nested” to avoid redundant instructions and to
provide more efficient programming. A “nested” branch is a branch that starts or ends
within another branch. You can nest branches up to four levels deep.
] [ ] [ ] [ ( )
] [
] [
] [
] [ ] [
] [
( )
( ) ] [
] [
Nested Input and Output Branches
] [
PLC-500 A.I. allows all branching combinations to be programmed in the MicroLogix,
fixed, SLC 5/01, 5/02, 5/03, and 5/04 processors.
Note The Hand Held Terminal (HHT) does not allow nested input and output branches to be
programmed in a fixed or SLC 5/01 processor.