Siemens Simatic 620 User Manual

Page 200

Glossary

Glossary-10

SIMATIC Box PC 620 Manual

A5E00131465-01

Interface

S An interface is the connection between individual hardware elements such as

PLCs, programming devices, printers, or monitors via physical connections

(cables).

S An interface is also the connection between different programs, to enable them

to work together.

Interface Module

Module which controls and extends the hardware periphery.

IRQ

Acronym for interrupt request. One of a set of possible hardware interrupts,

identified by a number. The number of the IRQ determines which interrupt handler

will be used. In the AT bus, ISA, and EISA, 15 IRQs are available. Each device’s

IRQ is hardwired or set by a jumper or DIP switch.

ISA

Industrial Standard Architecture (bus for expansion modules)

JEIDA

Japanese Electronics Industry Development Association. Association of Japanese

electronics manufacturers whose aim is to set up standards worldwide for the

miniaturization and flexible application of PC expansion cards. Cooperates with

PCMCIA.

Keyboard

A keyboard is the collection of keys which are used to input data, text, characters,
letters, numbers, special characters, and control commands in a computer. The
keyboard forms the input interface between the user and the computer.