Siemens PCIL43 manual Pata, Pci, Pcmcia, Pic, Post, Pxe, Raid, Rom, Rtc, Rts

		Abbreviations
		C.1 Abbreviations
Abbreviation	Term	Definition
PATA	Parallel ATA	An interface for hard disk drives and optical
		drives with parallel data transfer of up to 100
		Mbps
PC	Personal Computer
PCI	Peripheral Component Interconnect	High-speed expansion bus
PCMCIA	Personal Computer Memory Card	Association consisting of approx. 450 member
	International Association	companies of computer industry. Their focus is
		set on providing worldwide standards for
		miniaturization and flexible use of PC expansion
		cards, and thus to provide a basic technology to
		the market.
PE	Protective Earth
PG	Programming device	Compact programming device which meets the
		special requirements of industry. The PG is fully
		equipped for programming SIMATIC PLCs.
PIC	Programmable Interrupt Controller	Programmable interrupt controller
POST	Power On Self Test	Self-test performed by the BIOS after the
		computer is switched on. Performs a RAM test
		and a graphic controller test, for example. The
		system outputs audible signals (beep codes) if
		the BIOS detects any errors; the relevant
		message indicating cause of error is output on
		the screen.
PS/2	Personal System 2	PC architecture introduced by IBM towards the
		end of the 1980 decade; was originally designed
		to replace the open system of the PC AT/XT
		format.
PXE	Preboot Execution Environment	Software for running new PCs without hard disk
		data via the network
RAID	Redundant Array of Independent Disks	Redundant hard disk array. Data storage system
		which is used to store data alongside with the
		error correction codes (e.g. parity bits) on at least
		two hard disks, in order to increase system
		reliability and performance. The hard disk array is
		controlled by management programs and a hard
		disk controller for error correction. The RAID
		system is usually implemented in network
		servers.
RAM	Random Access Memory	Main or work memory of a computer with direct
		access, allowing read access to data and editing.
RI	Ring Input	Incoming call
ROM	Read-Only Memory	Semiconductor memory, can be also used for
		storing non-volatile data and programs in the
		manufacturing phase. Data stored on the ROM
		chip are read-only, and can neither be erased nor
		rewritten.
RS 485	Reconciliation Sublayer 485	Bi-directional bus system designed for up to 32
		nodes
RTC	Real Time Clock	Real-time clock
RTS	Reliable Transfer Service	Request to send

SIMATIC Rack PC IL 43	C-5
Operating Instructions, Edition 09/2005, A5E00432875-01