Siemens PCIL43 Cga, Clk, Cmos, Coa, Cpu, Csa, Cts, Dram, Ddram, Dcd, Dma, Dos, Dqs, Dsr, Dtr, Dvd

Abbreviations

C.1 Abbreviations

Abbreviation	Term	Definition
CGA	Color Graphics Adapter	Standard monitor interface
CLK	Clock pulse	Clock signal for controllers
CMOS	Complementary Metal Oxide	Complementary metal oxide semiconductors.
	Semiconductors	Computer chips featuring lower power
		consumption compared with common chipsets.
		They are, on the other hand, slower than
		conventional circuits.
COA	Certificate of Authentication	Microsoft Windows Product Key
CoL	Certificate of License	License authorization
COM	Communications Port	Term for the serial interface
CP	Communication Processor	Communication computer
CPU	Central Processing Unit	Central unit. Core component of the computer;
		responsible for all data processing routines. The
		processor receives the relevant data and
		programs from work memory.
CSA	Canadian Standards Association	Canadian standardization organization
CTS	Clear To Send	Clear to send
DP	Distributed I/Os
DRAM	Dynamic Random Access Memory
DDRAM	Double Data Random Access Memory	Memory chip with high-speed interface
DCD	Data Carrier Detect	Data carrier signal detection
DMA	Direct Memory Access	Direct memory access. Data transfer method for
		direct memory access, allowing data exchange
		between system components and the RAM
		without intervention of the CPU. This is controlled
		by the DMA controller, in order to reduce
		processor load and to significantly increase
		processing performance.
DOS	Disc Operating System	Operating system without GUI
DQS	Deutsche Gesellschaft zur Zertifizierung
	von Qualitätsmanagement mBH
DSR	Data Set Ready	Ready for operation
DTR	Data Terminal Ready	Data terminal is ready.
		Control signal for data transfer.
DVD	Digital Versatile Disc	Digital versatile disk. Standard that describes a
		data carrier which is similar to a conventional CD,
		but allows read/write operations on both sides of
		the DVD; storage capacity up to 8.5 GB of data.
DVI	Digital Visual Interface	Digital display interface
ECC	Error Correction Code	Error correction code. Method for the correction
		of errors in RAM chips; used in high-performance
		PCs.
ECP	Extended capability port	Extended parallel port
EGA	Enhanced Graphics Adapter	PC to monitor interface
ESD	Components sensitive to electrostatic
	charge
DM	Electronic Manual

C-2	SIMATIC Rack PC IL 43
	Operating Instructions, Edition 09/2005, A5E00432875-01