Siemens SIMATIC Box PC 620 Manual page 210

Glossary
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)
J
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.
K
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.
Glossary-10
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