Operating instructions

List of Abbreviations/Acronyms
B.1 Abbreviations
SIMATIC Panel PC 677B
Operating Instructions, 05/2007, A5E01035609-01
247
Abbreviation Term Meaning
NAMUR Normenarbeitsgemeinschaft für Mess- und
Regelungstechnik in der chemischen
Industrie (standardization body for
instrumentation and control technology in
the chemicals industry)
NC Not Connected Not connected
NCQ Native Command Queuing Automatic re-sorting of the file and disk access,
for increased performance
NEMA National Electrical Manufacturers
Association
Syndicate of manufacturers of electrical
components in the USA
NTFS New Techniques File System Secure file system for certain versions of
Windows (NT, 2000, XP)
OPC OLE for Process Control Standardized interface for industrial processes
PATA Parallel ATA
PCI Peripheral Component Interconnect High-speed expansion bus
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
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
SDRAM Synchronous DRAM
SELV Safety Extra Low Voltage Safety extra low voltage
SMART Self Monitoring Analysis and Reporting
Technology
Hard disk error diagnostics program
SNMP Simple Network Management Protocol Network protocol
SO-DIMM Small Outline Dual Inline Memory Module
SOM SafeCard on Motherboard (SOM)
SVGA Super Video Graphics Array Enhanced VGA standard with at least 256 colors
SVP Serial number of the device
TFT Thin-Film-Transistor Type of LCD flat-screen
TxD Transmit Data Data transfer signal
TWD Watchdog Time Watchdog monitoring time
UL Underwriters Laboratories Inc. US organization for tests and certifications
according to own or binational standards (with
CSA / Canada) standards