Abbreviations
C.1 Abbreviations
SIMATIC Box PC 627
C-4 Operating Instructions, Release 05/2006, A5E00362052-03
Abbreviation Term Meaning
PCI Peripheral Component Interconnect High-speed expansion bus
PCMCIA Personal Computer Memory Card
International Association
PI Protective Earth Protective conductor
PG Programming device
PIC Programmable Interrupt Controller Programmable interrupt controller
POST Power On Self Test
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
RAM Random Access Memory
RI Ring Input Incoming call
ROM Read-Only Memory
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
RxD Receive Data Data transfer signal
SATA Serial ATA
SCSI Small Computer System Interface
SDRAM Synchronous DRAM
SELV Safety Extra Low Voltage Safety extra low voltage
SMART Self Monitoring Analysis and Reporting
Technology
Hard disk error diagnostics program
SMS Short Message Service Short message via telecommunication network
SNMP Simple Network Management Protocol Network protocol
SO-DIMM Small Outline Dual Inline Memory Module
SOM SafeCard on Motherboard (SOM)
SPP Standard Parallel Port Synonym for parallel port
SVGA Super Video Graphics Array Enhanced VGA standard with at least 256 colors
SVP Serial number of the device
SW Software
TCO Total Cost of Ownership
TFT Thin-Film-Transistor Type of LCD flat-screen
TTY Tele Type Asynchronous data transfer
TxD Transmit Data Data transfer signal
TWD Watchdog Time Watchdog monitoring time
UL Underwriters Laboratories Inc. US organisation for tests and certifications
according to own or binational standards (with
CSA / Canada) standards
UMA Unified Memory Architecture
URL Uniform Resource Locator Designation of the full address of an Internet
page
USB Universal Serial Bus
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