Siemens Simatic 620 Manual do Utilizador descarregar pdf (Página 202)

Glossary

Glossary-12

SIMATIC Box PC 620 Manual

A5E00131465-01

Modem

Communications device that enables a computer to send and receive data over a

telephone line. Modulator and demodulator of a signal transmission facility. It

converts the digital pulses from a computer into analog signals (and vice versa).

Module

Modules are boards (printed circuit boards) which can be plugged into a

programmable logic controller or programming device. They are available, for

instance, as central controller modules, interface modules, or as bulk memory

modules.

Monitor

The device on which images generated by the computer’s video adapter are

displayed.

Mother Board

The mother board is the core of the programming device. From here data are

processed and stored, interfaces and device I/Os are controlled and managed.

Mouse

The mouse is a pointing device with which the user inputs coordinates (x,y). By

moving the mouse, the mouse pointer can be moved at will around the screen. By

pressing the left mouse button, the position is marked. The other mouse keys may

have different assignments according to the application. With the mouse, objects

can be selected, menus processed, and functions started.

Mouse Pointer

The mouse pointer is moved across the worktop (screen) by means of the mouse.

The mouse pointer selects, for example, objects which are to be processed.

MS-DOS

The single Microsoft-Disk-Operating-System is one of the standard OS for PCs.

Multimedia

The combination of sound, graphics, animation, and video. In the world of

computers, multimedia is a subset of hypermedia, which combines the

aforementioned elements with hypertext.

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