Siemens 620 appendix Ram, Rom, Rtc

Glossary

R

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.

Restart

Warm start of a computer in operate state without switching off the power supply (Ctrl + Alt + Del).

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

S

SCSI Interface

Small Computer System Interface. 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.

Glossary-16

SIMATIC Box PC 620 Manual A5E00131465-01