Siemens SIMATIC Rack PC 547B, Operating Instructions Manual

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List of abbreviations/acronyms
C.1 Abbreviations
SIMATIC Rack PC 547B
120
Operating Instructions, 12/2007, A5E01127519-02
Abbreviation Term Meaning
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
NMI Non Maskable Interrupt Interrupt the processor can not reject
NTFS New Techniques File System Secure file system for Windows versions (2000,
XP, Vista)
ODD Optical Disk Drive
OPC OLE for Process Control Standardized interface for industrial processes
PATA Parallel ATA
PC Personal computer
PCI Peripheral Component Interconnect High-speed expansion bus
PCIe Peripheral Component Interconnect
express
High-speed serial, differential full-duplex PtP
interface with high data rate.
PCMCIA Personal Computer Memory Card
International Association
PI Protective Earth Protective conductor
PEG PCI Express Graphics
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 Advanced Technology Attachment
SCSI Small Computer System Interface
SDRAM Synchronous DRAM
SELV Safety Extra Low Voltage Safety extra low voltage
SLC Second Level Cache
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)