Glossary
Glossary-4
SIMATIC Rack PC IL 40 SManual
A5E00200171-01
Booting
Loading operation which transfers the operating system to the main memory.
Bps
The speed (in bits per second) with which information is transmitted over a data
link.
C
Cache
The cache memory buffers often used data to increase the speed of access. The
computer has two cache levels.
Cardbus interface
This interface is compatible with 32-bit Cardbus Cards with PCI performance
compliant with the PC Card standard.
CD ROM
Compact Disc Read Only Memory. Removable memory for large amounts of data.
Click
Pressing and immediately releasing the left mouse button; selects objects or
triggers commands.
Cold Boot
A startup process that begins with turning on the computer’s power. Typically, a
cold boot involves some basic hardware checking by the system, after which the
operating system is loaded from disk into memory.
COM1 Port
Serial V.24/modem-PLC interface. This interface is suitable for asynchronous data
transmission. It can also be used to connect printers with a serial interface.
COM2 Port
Serial RS-232 interface which can be used to connect a mouse or a printer.
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