Glossary

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.

Lid Switch

The device is switched off by closing the display lid.

LPT1 Port

The LPT1 port (Centronics port) is a parallel interface that can be used to connect a printer.

LS240 Drive

Floppy disk drive that is capable of storing 240 MB of data on a single 3.5-inch floppy disk. LS-240 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

SIMATIC Box PC 620 Manual A5E00131465-01

Glossary-11

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Siemens 620 appendix Lcd, Led