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IT networks
Networks for Information technology
LAN
Local Area Network is a local network that consists of a group of computers and other
devices that are distributed across a relatively restricted range and are linked with
communication cables. The devices connected to a LAN are called nodes. The purpose of
networks is the mutual use of files, printers or other resources.
Legacy USB support
Support of USB devices (e.g. mouse, keyboard) on the USB ports without driver.
License key
The license key represents the electronic license stamp of a license. Siemens provides the
license keys for protected software.
License key diskette
The license key diskette contains the authorizations or license keys required to enable
protected SIMATIC software.
LPT port
The LPT1 port (Centronics port) is a parallel interface that can be used to connect a printer.
Main memory
This is a RAM area in the CPU which is accessed by the processor during user program
execution.
Main menu
Usually the main menu/initial menu of a program.
Memory Card
Memory cards in credit card format. Memory for user programs and parameters, for
example, for programmable modules and CPs.
Module
Modules are plug-in units for PLCs, programming device or PCs. They are available as local
modules, expansion modules, interfaces or mass storage (Mass storage module).
SIMATIC Rack PC IL 43
Operating Instructions, Edition 09/2005, A5E00432875-01
Glossary
Glossary-5
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