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Glossary
A
AC
Alternating Current. Current that changes its direction at regular intervals.
Access Protection
Access to the programs and data of a PC or PG can be protected by passwords.
ACPI
Advanced Configuration and Power Interface.
APM
Advanced Power Management
Application
An application is a program which builds directly on, for example, the operating
system. Applications on your PG or PC are STEP 7, STEP 7-Micro/WIN etc.
ASCII Editor
With an ASCII editor you can edit text files that are stored in ASCII code (American
Standard Code of Information Interchange).
B
Backup
Duplicate of a program, storage medium or database. Created to backup or to pro-
tect irreplaceable data of working copies as a precaution against corruption or des-
truction. Some applications automatically create backup copies, while managing
both the current version as well as the previous version that is stored on the hard
disk drive.
Base Memory
The base memory is a part of the main memory. It is 640 Kbytes 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.
BIOS
Acronym for Basic Input/Output System. On PC-compatible computers, the set of
essential software routines that tests hardware at startup, starts the operating sy-
stem, and supports the transfer of data among hardware devices.
Glossary-2
SIMATIC Box PC 840 Manual
A5E00085984-04
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