Siemens SIMATIC Series Manual page 108

Glossary
RAM
RAM (Random Access Memory) 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.
Recovery CD
Contains the DOS tools for setting up harddisks and the Windows operating
system.
Restart
Warm start of a computer in operate state without switching off the power supply
(Ctrl + Alt + Del).
Restore CD
The Restore CD restores your system partition or your entire harddisk to the
delivery state in the event of an error. The CD contains the image files required for
this procedure and you can boot from the CD. In addition, you can create a Start
diskette, which enables you to perform the restoration via networks.
ROM
ROM (Read Only Memory) 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
Glossary-16
SIMATIC Rack PC IL 40 SManual
A5E00200171-01