SIMATIC Rack PC 840 V2
Operating Instructions, Edition 05/2006, A5E00248055-04
Glossary-1
Glossary
ATAPI CD–ROM Drive
AT-Bus Attachment Packet Interface (connected to AT bus) CD-ROM drive
Automation device (AG)
The programmable logical controllers (PLC) of the SIMATIC S5 system consist of a central
controller, one or more CPUs, and various other modules (e.g. I/O modules).
Automation system (AS)
The programmable logical controllers (PLC) of the SIMATIC S7 system consist of a central
controller, one or more CPUs, and various I/O modules.
Backup
Duplicate of a program, data carrier or database, used either for archiving purposes or for
the protection of vital and non-replaceable data against loss when the working copy is
corrupted. Some applications automatically generate backup copies of data files, and
manage both the current and the previous versions on the hard disk.
Baud
Physical unit for the step speed in signal transmission. Defines the number of transferred
signal states per second. With only two states, one baud is equivalent to a transmission rate
of 1 bps.
BEEP code
If the BIOS detects a boot error, it outputs an audible warning based on the current test
result
Boot diskette
A diskette that contains a boot sector and an initial loader for the operating system. This can
be used to load the operating system from the disk.
Booting
Start or restart of the computer. During booting the operating system is transferred from the
system data carrier to the work memory.
