Siemens SIMATIC Box PC 620 Manual page 196

Glossary
LS 120 drive
The LS 120 drive is compatible with previous 3.5"-disk drives. With the LS 120
drive, normal floppy disks (1.44Mbyte) as well as Superdisks with up to 120 Mbyte
capacity can be used.
M
Main Memory
The main memory is the complete RAM memory of a programming device.
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.
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.
Glossary-8
SIMATIC Box PC 620 Manual
C79000-G7076-C639-04