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Glossary
Application
An application is a program which builds directly on the MS-DOS / Windows operating
system. Applications on your PG or PC, for example, are STEP 7, STEP 7-Micro/WIN.
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 systems 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 systems (S5 or S7) 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.
Base memory
The base memory is a part of the main memory. Its size is 640 K for all programming
devices. The size is entered in the SETUP menu under the entry "Base Memory" and is not
changed even if the memory is extended.
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.
SIMATIC Rack PC IL 43
Operating Instructions, Edition 09/2005, A5E00432875-01
Glossary-1
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