List of abbreviations
SIMATIC IPC547D
120 Operating Instructions, 06/2011, A5E03473780-01
Abbreviatio
n
Term Meaning
NA Not Applicable
NAMUR Normenarbeitsgemeinschaft for 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
NMI Non Maskable Interrupt Interrupt the processor can not reject
NTFS New Techniques File System Secure file system for Windows versions
(2000, XP, 7)
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
PFC Power Factor Correction Harmonic suppression for operation on
public networks.
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
RAL Restricted Access Location Installation of device in operating
facilities with restricted access - for
example, a locked switchgear cabinet
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
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