Glossary
Glossary-8
SIMATIC Field PG Manual
A5E00075760-04
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.
Industrial Standard Architecture (bus for expansion modules)
J
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
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.
L
LCD
Liquid Crystal Display. Display type on the base of liquid crystals with a thin film
polarized molecular structure, enclosed between two transparent electrodes.
LED
Light Emitting Diode (for example, status display). Semiconductor diode that
transforms electrical energy into light.
The LPT1 port (Centronics port) is a parallel interface that can be used to connect
a printer.
IRQ
ISA
JEIDA
Keyboard
LPT1 Port
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