Rockwell Automation AutoMax Enhanced Ladder Editor User Manual

Page 82

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If a parallel branch

contains:

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The instructions are executed as follows:

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relay input instructions

using simple variables

The logic is executed starting at the last parallel

branch and going up the branches until a true

row is encountered. Once a true row is

encountered, any branches remaining above

the true branch will not be executed.

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relay input instructions,

bitĆindexed integer or

double integer variables, or

elementĆindexed array

variables

All parallel branches are executed, starting with

the last branch and working up the parallel

branches.

Branching technique #2:
Connecting a logical sequence of instructions composed of inputs and an

output in parallel to a rung

How the branches are executed:
Parallel branches made up of a sequence of instructions composed of inputs

and an output are executed as follows:

D Each branch is fully executed before the main rung
D Multiple parallel branches are executed from the bottom up

Branching technique #3:
Connecting one or more coils parallel to a rung

How the branches are executed:
Parallel branches comprised of coils are executed as follows:

D Logic preceding the branched coil is executed, followed by the branched

coils. The bottom coil of the branch is executed first and the top coil of the

branch is executed last.

D Once the branched coils have been executed, the remaining logic of the

main rung is executed.

Programming Techniques
The relay output instructions (coils) and the outputs of block instructions are set

when the instruction is executed. Therefore, if a variable is used as an input and

as an output within the same program, you can use a more recent value for the

input if the output instruction is executed first. For example, the variable motor_1