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Glossary - Siemens SIMATIC IPC277D Operating Instructions Manual

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AHCI mode
AHCI is a standardized method to address the SATA controller. AHCI describes a structure
in the RAM, which contains a general area for control and status, as well as a command list.
APIC mode
Advanced peripheral interrupt controller. 24 interrupt lines are available.
Automation system
A programmable controller (PLC) of the SIMATIC S7 system consist of a central controller,
one or several CPUs, and various I/O modules.
Duplicate of a program, data medium 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. Certain applications automatically generate backup copies of data files, and
manage both the current and the previous versions on the hard disk.
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.
Boot disk
A boot disk is a disk with a "Boot" sector. This can be used to load the operating system from
the disk.
High-speed access buffer for interim storage (buffering) of requested data.
CE marking
Communauté Européene The CE mark confirms compliance of the product with
corresponding EC Directives, for example, with the EMC Directive.
Operating Instructions, 12/2016, A5E03409486-AE


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