Appendix List of abbreviations
SIMATIC IPC347E
Operating Instructions, 09/2018, A5E41134132-AE
129
Abbreviation
Term
Meaning
NAMUR
Normenarbeitsgemeinschaft for Mess- und
Regelungstechnik in der chemischen Indus-
trie (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
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 Interna-
tional 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 facili-
ties 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
SATA
Serial Advanced Technology Attachment
SCSI
Small Computer System Interface
SDRAM
Synchronous DRAM
