Siemens SIMATIC PG 720 P Manual page 116

Glossary
J
JEIDA
(Japanese Electronics Industry Development Association) Association of
Japanese electronics manufacturers whose aim is to set up standards
worldwide for the miniaturization and flexible application of PC expansion
cards. Cooperates with PCMCIA.
K
Keyboard
The keyboard is the collection of keys which are used to input data, text,
characters, letters, numbers, special characters, and control commands in a
computer. The keyboard forms the input interface between the user and the
computer.
L
LED
Light-emitting diode (for display and indicating purposes).
LPT1 Port
The LPT1 port (Centronics port) is a parallel interface that can be used to
connect a printer.
M
Main Memory
The main memory is the complete RAM memory of a programming device.
Memory Card
Memory submodule in credit-card format containing RAMs or EPROMs.
Memory See Extended Memory
Expansion
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.
Glossary-6
PG 720 P Programming Device
C79000-G7076-C721-02