B&R MAPPC700A-ENG, User Manual

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Appendix A • Glossary
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487 Panel PC 700 with 945GME N270 CPU board User's Manual V 1.16
Bit
Binary digit > binary position, binary character, smallest discrete unit of information. A bit can
have the value 0 or 1.
Bit rate
The number of bits that can be transferred within a specified time unit. 1 bit/sec = 1 baud.
Bootstrap loader
A program that automatically runs when the computer is switched on or restarted. After some
basic hardware tests have been carried out, the bootstrap loader starts a larger loader and hands
over control to it, which in turn boots the operating system. The bootstrap loader is typically found
in ROM on the computer.
Byte
Data format [1 byte = 8 bits] and a unit for characterizing information amounts and memory
capacity. The following units are the commonly used units of progression: KB, MB, GB.
B&R Automation Runtime
Windows-based program for creating installation disks to install B&R Automation Runtime™ on
the target system.
Cache
Background memory, also known as non-addressable memory or fast buffer memory. It is used
to relieve the fast main memory of a computer. For example, data that should be output to slower
components by the working memory (e.g. disk storage, printers) is stored temporarily in cache
memory and output from there at an appropriate speed for the target devices.
CAN
An abbreviation for " C ontroller A rea N etwork" (serial bus system). Structure according to ISO
11898; Bus medium: twisted pair. Good transfer properties in short distances less than 40 m with
a 1 Mbit/sec data transfer rate. Maximum number of stations: Theoretically unlimited, but
practically limited up to 64. Real-time capable (i.e. defined maximum latency times for messages
with high priority). High reliability using error detection, error handling, troubleshooting. Hamming
distance.
CD-ROM
Abbreviation for " C ompact D isc R ead- O nly M emory". A removable data medium with a capacity
of ~700 MB. CD-ROMs are optically scanned.
C