B&R Industries Power Panel 300 User Manual page 550

Appendix A • Glossary
C
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.
CE mark
A CE mark for a product. It consists of the letters "CE" and indicates conformity to all EU
guidelines for the labeled product. It indicates that the individual or corporate body who has
performed or attached the label assures that the product conforms to all EU guidelines for
complete harmonization. It also indicates that all mandatory conformity evaluation procedures
have taken place.
CMOS
"CMOS" is a battery powered memory area where fundamental parameters of an IBM (or
compatible) personal computer are stored. Information such as the type of hard drive, size of the
working memory and the current date and time are required when booting the computer. As the
name suggests, the memory is based on CMOS technology standards.
COM
A device name used to access serial ports in MS-DOS. The first serial port can be accessed
under COM1, the second under COM2, etc. A modem, mouse, or serial printer is typically
connected to a serial port.
CompactFlash®
CompactFlash memory cards [CF cards] are exchangeable nonvolatile mass memory systems
with very small dimensions [43 x 36 x 3.3 mm, approximately half the size of a credit card]. In
addition to the flash memory chips, the controller is also present on the cards. CF cards provide
complete PC card / ATA functionality and compatibility. A 50-pin CF card can be simply inserted
in a passive 68-pin type II adapter card. It conforms to all electrical and mechanical PC card
interface specifications. CF cards were launched by SanDisk back in 1994. Currently, memory
capacities reach up to 8 GB per unit. Since 1995, CompactFlash Association [CFA] has been
looking after standardization and the worldwide distribution of CF technology
Controller
A device component which allows access to other devices on a computer subsystem. A disk
controller, for example, allows access to hard disks and disk drives and is responsible both for
physical and logic drive access.
550 Power Panel 300/400 User's Manual V 2.10