Siemens Simatic Field PG Manual page 133

LS120-Drive
Floppy disk drive that is capable of storing 120 MB of data on a single 3.5-inch
floppy disk. LS-120 drives are also compatible with other floppy disk formats.
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
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 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.
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.
SIMATIC Field PG Manual
A5E00075760-04
Glossary
Glossary-9