Siemens SIMATIC Box PC 820 Manual page 186

Glossaryx
Memory Card
Memory cards are memory for user programs and parameters in credit-card for-
mat, for example, for programmable modules and CPs.
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 mass memory modules.
Monitor
The monitor or screen is a visual display unit via which the programming device
communicates with the user.
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 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 enables access to programmable modules, text displays, and operator panels
from a central point. The stations on the MPI can communicate with each other.
Glossary-8
Box PC 820 / PC FI45 V2, Manual
A5E00051531-03