Siemens PC 870 Operations Instructions Page 154

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Appendix
16.3 Glossary
Panel PC 870 V2, Computer Unit
16-8 Operating Instructions, Edition 03/2004, CD Documentation and Drivers
16.3 Glossary
A
User program
The user program contains all instructions and declarations, as well as signal processing
data which can be controlled by the plant or the process. It is assigned to a programmable
module (Module, programmable) (e.g. CPU, FM) and can be granulated into smaller units
(blocks).
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.
Main memory
This is a RAM area in the CPU which is accessed by the processor during user program
execution.
“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.
B
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.
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