B&R Industries Power Panel 300 User Manual page 555

P
PnP
An abbreviation for "Plug and Play". Specifications developed by Intel. Using Plug and Play
allows a PC to automatically configure itself so that it can communicate with peripheral devices
(e.g. monitors, modems, and printers). Users can connect a peripheral device (plug) and it
immediately runs (play) without having to manually configure the system. A Plug and Play PC
requires a BIOS that supports Plug and Play and a respective expansion card.
POH
An abbreviation for "Power On Hours". See MTBF.
POST
An abbreviation for "Power-On Self Test". A set of routines that are stored in ROM on the
computer and that test different system components, e.g. RAM, disk drive and the keyboard in
order to determine that the connection is operating correctly and ready for operation. POST
routines notify the user of problems that occur. This is done using several signal tones or by
displaying a message that frequently accompanies a diagnosis value on the standard output or
standard error devices (generally the monitor). If the POST runs successfully, control is
transferred over to the system's bootstrap loader.
Power Panel
Power Panel is part of the B&R product family and is a combination of an operator panel and
controller in one device. This covers the PP21 and PP41 products.
Q
QVGA
Abbreviation for Quarter Video Graphics Array. Usually a screen resolution of 320 × 240 pixels.
R
RAM
An abbreviation for "Random Access Memory". 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.
ROM
An abbreviation for "Read-Only Memory". Semiconductor memory where programs or data were
permanently stored during the production process.
Power Panel 300/400 User's Manual V 2.10
Appendix A • Glossary
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