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Glossary
M
Main Memory
The main memory is the complete RAM memory of a programming device.
Memory Card
Memory submodule in credit-card format containing RAMs or EPROMs.
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 controller or programming device. They are available, for
instance, as central controller modules, interface modules or as bulk memory
modules.
Monitor
The monitor or screen is a visual display unit via which the programming
device communicates with the user.
Motherboard
The motherboard 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 an input 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.
MPI/DP
The multipoint interface (MPI) is the programming device interface of
SIMATIC S7. It permits the simultaneous operation of several programming
devices, text, displays, operator panels on one or more central processing
units. The stations on the MPI are connected together via a bus system.
MS-DOS
(Microsoft Disk Operating System) is one of the standard operating systems
for personal computers. It is a single-user system and is supplied installed on
all our programming devices.
Glossary-6
Programming Device PG 740
C79000-G7076-C742-01
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