Glossary
Glossary-16
SIMATIC Rack PC 840 Manual
A5E00104826-03
R
RAM
RAM (
R
andom
A
ccess
M
emory) is a volatile read/write memory in which every
memory location can be addressed individually and its contents changed. RAM is
used to store data and programs.
Rechargeable Battery
Reachargeable battery is used as a power source for laptop and notebook
computers independent of external power supply. It also prevents the loss of data
as a result of power failure.
Restart
Warm start of a computer in operate state without switching off the power supply
(Ctrl + Alt + Del).
ROM
ROM (
R
ead
O
nly
M
emory) is a non-volatile memory in which every memory
location can be addressed individually. They contain factory set programs and data
that are not lost in the event of a power failure.
RS-232 Interface
The RS-232 interface is a standardized interface for data transmission. Printers,
modems and other hardware modules can be connected to a RS-232 interface.
RTC
Real Time Clock
S
SCSI Interface
S
mall
C
omputer
S
ystem
I
nterface. Interface for connecting SCSI devices (hard
disk drives, CD-ROM drives).
Serial Interface
Data is transmitted one bit at a time via a serial interface (port); serial interfaces
are therefore slower than parallel interfaces.
Содержание SIMATIC Box PC 840
Страница 8: ...Preface viii SIMATIC Rack PC 840 Manual A5E00104826 03 ...
Страница 179: ...B 1 SIMATIC Rack PC 840 Manual A5E00104826 03 Technical Specifications B ...
Страница 208: ...Glossary Glossary 22 SIMATIC Rack PC 840 Manual A5E00104826 03 ...
Страница 212: ...Index Index 4 SIMATIC Rack PC 840 Manual A5E00104826 03 ...