Siemens SIMATIC Field PG P4, Manual, Page: 135 / 144

Glossary
Glossary-9
SIMATIC Field PG P4 Manual
A5E00180080-04
M
Main Memory
Main memory is a RAM memory in the CPU that is accessed by the CPU during
user program processing.
Memory Card
Memory Cards in credit card format. memory for user programs and parameters,
for example, for programmable modules and CPs.
Micro Memory Card
New and very compact card for SIMATIC.
Memory Expansion
See Extended Memory
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).
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.
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.
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.
Modem
Module
Mother Board
Mouse