Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 112)

Ladder Program Basics
5-7
Input Branching
Use an input branch in your application program to allow more than one combination
of input conditions to form parallel branches (OR logic conditions). If at least one of
these parallel branches forms a true logic path, the rung logic is enabled. If none of the
parallel branches forms a true logic path, rung logic will not be enabled, the output
instruction logic will not be true, and the output will not be energized.
] [
] [
( )
A
D
C
Parallel Input Branching
] [ /
B
In the above example, either A and B, or C can provide a true logical path.
Output Branching
You can program parallel outputs on a rung to allow a true logic path to control
multiple outputs. When there is a true logic path, all parallel outputs become true.
] [
] [
( )
A
C
B
Parallel Output Branching
( ) U
E
Move
Source S:3
Dest N7:10
MOV
In the above example, either A or B provides a true logical path to all three output
instructions.