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Memory Expansion
See Extended Memory
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, a programming device or a PC. They are available, for
instance, as central controller modules, interface modules, or as mass memory
modules.
Monitor
The monitor or screen is a visual display unit via which the computer communica-
tes with the user.
Motherboard
The motherboard is the core of the computer. 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/M7. It enables access to programmable modules, text displays, and operator
panels from a central point. The stations on the MPI can communicate with each
other.
SIMATIC Box PC 840 Manual
A5E00085984-04
Glossary
Glossary-9

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