Glossary
Glossary-11
SIMATIC Rack PC 840 Manual
A5E00104826-03
L
LCD
L
iquid
C
rystal
D
isplay. Display type on the base of liquid crystals with a thin film
polarized molecular structure, enclosed between two transparent electrodes.
LED
L
ight
E
mitting
D
iode (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
Summary of Contents for SIMATIC Box PC 840
Page 8: ...Preface viii SIMATIC Rack PC 840 Manual A5E00104826 03 ...
Page 179: ...B 1 SIMATIC Rack PC 840 Manual A5E00104826 03 Technical Specifications B ...
Page 208: ...Glossary Glossary 22 SIMATIC Rack PC 840 Manual A5E00104826 03 ...
Page 212: ...Index Index 4 SIMATIC Rack PC 840 Manual A5E00104826 03 ...