Watlow LogicPro User Manual
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Glossary
LogicPro User’s Guide
276
Watlow Anafaze
Doc.# 28002-00 Rev 3.00
O
Object
In a GUI environment, this is an element that you can
select and manipulate.
Operators
A symbol used in an expression to represent an action.
For example, in the expression z + 7 the “+” is an op-
erator representing addition, while the “z” and “7” are
operands.
Origin Step
Initial step in a process control Program.
Output
That which comes forth from any computer operation.
This may take the form of data, graphics and audio in-
formation.
Output Variable
A Variable used for outputting data.
P
Parallel
A method of transmitting several bits of data simulta-
neously. This can be contrasted with serial which
transmits one bit at a time.
Parallel Port
An interface port that supports data transmission of
several bits simultaneously. The most common device
using this connection is a printer or external removable
disc drive. The parallel port is a twenty-five (DB-25)
pin connector.
Parameter
A value that, in programming, is passed to a routine.
Sometimes known as an argument.
Path
The location of a file in relationship to the various di-
rectories and subdirectories that tie it to the root direc-
tory.
Platform
The base hardware and software on which a system is
built. For instance, an Intel Pentium II Pro processor
running Windows NT is a platform, while a Sun Sparc
running UNIX is another.
Plug and Play
A PC hardware and operating system specification in
which Windows 95/NT automatically detects and ad-
dresses PC hardware.
PnP
See Plug and Play.
Power Rails
The vertical lines on the left and the right ends of each
rung in a Ladder Program. LogicPro does not display
the right power rails, these are assumed to be there.
Process
This can mean a Program that is running or a task.
Process Flow
The logical “control flow” of a process.
Processor
Microprocessor, the silicon chip that runs the logic for
all digital devices and contains the CPU.
Program
Base unit of a Project which defines what the control-
ler does, at what time, and in what sequence.
Program Variables
Variables that are only available at the Program level.
Project
The highest level of organization in LogicPro. Projects
consist of Resources which, in turn, contain Programs.