B&R MAPPC800-ENG, Руководство пользователя

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Appendix A • Glossary
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373 Panel PC 800 User's Manual V 1.00
PROFIBUS-DP
PROFIBUS for "decentralized peripherals". PROFIBUS DB can be used to allow simple digital
and analog I/O modules as well as intelligent signal and data processing units to be installed in
the machine room, which among other things can significantly reduce cabling costs. Often used
for time-critical factory automation applications.
QVGA
Abbreviation for " Q uarter V ideo G raphics A rray". Usually a screen resolution of 320 × 240 pixels.
QUXGA
Abbreviation for " Q uad U ltra E x tended G raphics A rray". Generally a screen resolution of 3200
× 2400 pixels (4:3). Quad implies the 4x greater pixel resolution compared to the UXGA.
QWUXGA
Abbreviation for " Q uad WUXGA "; Generally a screen resolution of 3840 × 2400 pixels (8:5,
16:10).
RAM
An abbreviation for " R andom A ccess M emory". Semiconductor memory which can be read or
written to by the microprocessor or other hardware components. Memory locations can be
accessed in any order. The various ROM memory types do allow random access, but they
cannot be written to. The term RAM refers to a more temporary memory that can be written to
as well as read.
Real time
A system is operating in real time or has real-time capability if the input sizes (e.g. signals, data)
are received and processed in a defined time period, and the results are made available in real
time for a partner system or the system environment. See also "real-time demands" and "real-
time system".
ROM
An abbreviation for " R ead- O nly M emory". Semiconductor memory where programs or data were
permanently stored during the production process.
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