Glossary
Glossary-11
SIMATIC Rack PC IL 40 SManual
A5E00200171-01
K
Keyboard
A 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
LCD
Liquid Crystal Display. Display type on the base of liquid crystals with a thin film
polarized molecular structure, enclosed between two transparent electrodes.
LED
Light Emitting Diode (for example, status display). Semiconductor diode that
transforms electrical energy into light.
LPT1 Port
The LPT1 port (Centronics port) is a parallel interface that can be used to connect
a printer.
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
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