3G5A2-RPT01-PE datasheet(173/182 Pages) OMRON

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Glossary

161

Programmable Controller

A computerized device that can accept inputs from external devices and gener-

ate outputs to external devices according to a program held in memory. Pro-

grammable Controllers are used to automate control of external devices. Al-

though single-unit Programmable Controllers are available, building-block Pro-

grammable Controllers are constructed from separate components. Such Pro-

grammable Controllers are formed only when enough of these separate compo-

nents are assembled to form a functional assembly, i.e., there is no one individu-

al Unit called a PC.

Programming Console

The simplest form or programming device available for a PC. Programming

Consoles are available both as hand-held models and as CPU-mounting mod-

els.

Programming Device

A Peripheral Device used to input a program into a PC or to alter or monitor a

program already held in the PC. There are dedicated programming devices,

such as Programming Consoles, and there are non-dedicated devices, such as

a host computer.

PROM

Programmable read-only memory; a type of ROM into which the program or

data may be written after manufacture, by a customer, but which is fixed from

that time on.

PROM Writer

A peripheral device used to write programs and other data into a ROM for per-

manent storage and application.

prompt

A message or symbol that appears on a display to request input from the opera-

tor.

protocol

The parameters and procedures that are standardized to enable two devices to

communicate or to enable a programmer or operator to communicate with a de-

vice.

See

present value.

Rack

An assembly that forms a functional unit in a Rack PC System. A Rack consists

of a Backplane and the Units mounted to it. These Units include the Power Sup-

ply, CPU, and I/O Units. Racks include CPU Racks, Expansion I/O Racks, and

I/O Racks. The CPU Rack is the Rack with the CPU mounted to it. An Expansion

I/O Rack is an additional Rack that holds extra I/O Units. An I/O Rack is used in

the C2000H Duplex System, because there is no room for any I/O Units on the

CPU Rack in this System.

rack number

A number assigned to a Rack according to the order that it is connected to the

CPU Rack, with the CPU Rack generally being rack number 0.

Rack PC

A PC that is composed of Units mounted to one or more Racks. This configura-

tion is the most flexible, and most large PCs are Rack PCs. A Rack PC is the

opposite of a Package-type PC, which has all of the basic I/O, storage, and con-

trol functions built into a single package.

RAM

Random access memory; a data storage media. RAM will not retain data when

power is disconnected.

RAS

An acronym for reliability, assurance, safety.

refresh

The process of updating output status sent to external devices so that it agrees

with the status of output bits held in memory and of updating input bits in memory

so that they agree with the status of inputs from external devices.

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