Rockwell-automation 1747-PTxx Getting Started Guide for HHT Manual de usuario descargar pdf (Pagina 68)

A–B

Glossary

Getting Started Guide

for HHT

G–1

Glossary

The following terms are used throughout this manual. Refer to them while

working in this manual.

address: A character string that uniquely identifies a memory location. For

example, I:1/0 is the memory address for the data located in the Input file

location 1/0.

APS: (Advanced Programming Software) Software for a computer used to

monitor and develop SLC 500 ladder logic programs.

attach: To establish communication with a processor.

bit: The smallest storage location in memory that contains either a 1 (ON) or

a 0 (OFF).

branch: A parallel logic path within a rung of a ladder program.

communication scan: A part of the SLC’s operating cycle. Communication

with other devices, such as the HHT, takes place.

controller: A device, such as a programmable controller, used to monitor

input devices and control output devices.

CMOS (Complementary Metal–Oxide Semiconductor): A semiconductor

device in which an electric field controls the conductance of a channel under

a metal electrode called a gate.

CPU (Central Processing Unit): The decision–making and data storage

section of a programmable controller.

data file: An area within a processor file that contains the status of inputs,

outputs, the processor, timers, counters, and so on.

download: To transfer a program from HHT memory to an SLC.

edit: To create or modify a ladder program.

expansion rack: A 2–slot rack used only with fixed controllers.

false: The status of an instruction that does not provide a continuous logical

path on a ladder rung.

file: A collection of information organized into one group.

fixed controller: A controller with a power supply, CPU, and I/O integrated

into a single package.

function keys: Keys on a personal computer or HHT keyboard labeled F1,

F2 and so on. The operation of each of these keys is defined by HHT.

hardware: The components that comprise a programmable controller, such

as Input modules, Output modules, and the CPU.

HHT: Hand–held Terminal.

I/O (Inputs and Outputs): Consists of input and output devices which

provide and/or receive data from the programmable controller.

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