B&R MAPPC700A-ENG, User Manual

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Appendix A • Glossary
Appen
dix
A
491 Panel PC 700 with 945GME N270 CPU board User's Manual V 1.16
EMC
" E lectro m agnetic C ompatibility" The ability of a device or a system to function satisfactorily in its
electromagnetic environment without introducing intolerable electromagnetic disturbances to
anything in that environment [IEV 161-01-07].
EPROM
E rasable PROM > (completely with ultraviolet light).
Ethernet
An IEEE 802.3 standard for networks. Ethernet uses bus or star topology and controls the traffic
on communication lines using the access procedure CSMA/CD (Carrier Sense Multiple Access
with Collision Detection). Network nodes are connected using coaxial cables, fiber optic cables
or twisted pair cabling. Data transfer on an Ethernet network takes place in frames of variable
lengths that consist of supply and controller information as well as 1500 bytes of data. The
Ethernet standard provides base band transfers at 10 megabit and 100 megabit per second.
Ethernet POWERLINK
An enhancement of standard Ethernet. It enables data exchange under strict real-time
conditions with cycle times down to 200 μs and jitter under 1 μs. This makes Ethernet power
available on all communication levels of automation technology – from control levels to I/O.
Ethernet POWERLINK was initiated by the company B&R Industrie-Elektronik and is now
managed by the open end user and vendor association, EPSG - Ethernet POWERLINK
Standardization Group (
www.ethernet-powerlink.org ).
FDD
Abbreviation for " F loppy D isk D rive". Reading device for removable magnetic memory from the
early days of PC technology. Due to their sensitivity and moving components, FDDs have been
almost completely replaced by CompactFlash memory in modern automation solutions.
Fiber optics
Fiber optic cable
FIFO
An abbreviation for " F irst I n F irst O ut". A queuing organization method whereby elements are
removed in the same order as they were inserted. The first element inserted is the first one
removed. Such an organization method is typical for a list of documents that are waiting to be
printed.
Firmware
Programs stored permanently in read-only memory. Firmware is software used to operate
computer-controlled devices that generally stays in the device throughout its lifespan or over a
long period of time. Such software includes operating systems for CPUs and application
F