Watlow LogicPro User Manual

Page 293

LogicPro User’s Guide

Glossary

Doc.# 28002-00 Rev 3.00

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277

Project Variables

Variables that are available to all the Resources and
Programs in a Project.

Pull-down menu

A command menu specific to each major LogicPro
function which drops down from the Menu Bar when
selected.

Pulse

A signal characterized by a sharp rise and fall. Either
the number of these signals (count) or frequency may
be of interest.

Radio Button

A type of button used in the graphic user interface that
allows you to choose only one option from a group.
Selecting an option deselects all of the other options.

Rails

See Power Rails.

RAM

An acronym for Random Access Memory, which is
used to store variables while a Program is running.

Range

The set of all possible values for a type of variable.

Real

Numerical variables with floating point decimals that

can range from -10

300

to 10

300

in LogicPro.

Rebuild

To recompile a LogicPro Program. See Build.

Reference Value

A value used for comparison in LogicPro Programs.

Resource

Hardware controller which operates the process once
the C code generated by the LogicPro Program is load-
ed.

Resource Variables

Variables that are available to all the Programs written
for a particular Resource.

Retentive Variable

A variable whose value is saved in the event that pow-
er is lost to the controller. Thus, with the restoration of
power, this value is still available.

Right Power Rail

This object is not visible in LogicPro, it is assumed to
be there. See Power Rail.

RS-232

Electronics Industry Association (EIA) approved in-
terface for connecting serial devices.

Rubber-Band Line

The graphical indicator of what is being included in a
selection when editing a program.

Rung

The horizontal line located between the left and right
power rails of a Ladder Program where the elements
are placed.

SCAN

Scan Time Counter Function Block.

Scan Rates

The frequency at which LogicPro Programs execute
one complete cycle.

Scanning

The time it takes for a LogicPro Program to complete-
ly execute once.