Siemens SIMATIC Panel PC 677 Operating Instructions Manual page 89

Interface
The connection of individual hardware elements, e.g. automation device, PCs, programming
device, printer, or screen, by means of physical plug connectors.
Connection between different programs in order to exchange data.
L
LPT interface
The LPT interface is a parallel centronic interface to which a printer is connected, for
example.
M
Module
Modules are plug-in units for PLCs, programming devices, or PCs. Modules exist, for
example, as central modules, power-ons, or as mass storage.
Motherboard
The motherboard, as the central part of the computer, processes and stores data, controls
and manages interfaces and peripheral devices.
P
Plug and play
Through plug and play, the computer configures itself automatically to be able to
communicate with peripheral devices, e.g. screens, modems and printers. User connects a
peripheral device: plug. Afterwards, the peripheral device can be used immediately. play,
without having to configure the operating system manually. The Plug and Play PC requires
both a BIOS that supports Plug and Play and a corresponding expansion card.
R
RAM
The main memory represents the complete RAM area on a PC/PG.
Recovery CD
Contains the DOS tools for installing drivers in hard disks and Windows operating systems.
Restore CD
The Restore CD is used to restore the system partition or the entire hard disk to factory state
if the system has crashed. The bootable CD contains all the necessary image files. They
create a start diskette which restores the factory state through the network drive.
ROM memory
Read-Only Memory The ROM memory is a read only memory in which every memory
location can be addressed individually. They contain factory set programs and data that are
not lost in the event of a power failure.
V
V.24 interface
The V.24 interface is a standardized port for data transfer. Connect printers, modems, and
other hardware components to the V.24 interfaces.
SIMATIC PC Panel PC 677/877, Control Unit
Operating Instructions, Edition 04/2005, A5E00407724-01
Glossary
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