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Pointe Controller User Guide Chapter 5: Developing Controller Programs

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5.4 Defining Variables in Logic Memory

In PointeControl, Logic Memory is the database of all tags, variables, and data

structures used in your program. Logic Memory is globally accessible, allowing all

Flow Charts, Ladder Diagrams, and I/O points to communicate freely and

continuously with each other using the same data in common. For example, a

Flow Chart can read a variable that was set by a Ladder Diagram, or a Flow Chart

and a Ladder Diagram can both monitor an input tag that is associated with one

of the controller’s I/O points, and so on.

Logic Memory supports the following data types:

 An Input tag is a bit, integer, or real number variable that is associated

with a Pointe Controller input channel.

 A Memory tag is a bit, integer, or real number variable that is stored in

temporary memory.

 An Output tag is a bit, integer, or real number variable that is associated

with a Pointe Controller output channel.

 A String is used to store ASCII text. Strings can also be associated with

operator panel display lines.

 A Timer is a special data structure that is used to count real time in

milliseconds, based on the Pointe Controller’s internal clock rather than

on the project’s scan cycle.

As you define tags and variables in Logic Memory, keep in mind which tags you

will need to associate with to the Pointe Controller’s I/O points and which you will

need to facilitate your program’s internal logic flow.

NOTE: All tags and variables are defined using plaintext names or “aliases.” DRVs

and wire labels are not used in PointeControl.

5.4.1 Java reserved words

Since your PointeControl project will ultimately be compiled into Java classes, you

cannot use any of Java’s “reserved words as aliases in Logic Memory. Reserved

words are terms that have their own inherent functions within the programming

language itself and therefore can conflict with similarly named variables.

PointeControl will automatically check for conflicts whenever you attempt to

compile your project, but it is better to avoid using reserved words when defining

your variables in the first place.

Java’s reserved words include:

abstract

boolean

default

goto

operator

outer

synchronized

this

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