Abbreviations
SIMATIC Rack PC 840 V2
Operating Instructions, Edition 05/2006, A5E00248055-04
19-3
Abbreviation
Term
Meaning
I/O
Input/Output
Data input/output on computers
IDE
Integrated Device Electronics
IEC
International Electronical Commission
IP
Ingress Protection
Degree of protection
IR
Infrared
Infrared
IRDA
Infrared Data Association
Standard for data transfer via IR module
IRQ
Interrupt Request
Interrupt request
ISA
Industry Standard Architecture
Bus for expansion modules
IT
Information Technology
Information technology
LAN
Local Area Network
Computer network that is limited to a local area.
LCD
Liquid Crystal Display
Liquid crystal display
LEDs
Light Emitting Diode
Light emitting diode
LPT
Line Printer
Printer port
LVDS
Low Voltage Differential Signaling
LW
Disk drive
MAC
Media access control
Media access control
MC
Memory Card
Memory card in credit card format
MLFB
Machine-readable product designation
MMC
Micro Memory Card
Memory card with the format 32 x 24.5 mm
MPI
Multipoint-capable interface for
programming devices
MS-DOS
Microsoft Disc Operating System
MTBF
Mean Time Between Failures
MUI
Multilanguage User Interface
Language localization in Windows
NA
Not Applicable
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
NMI
Non Maskable Interrupt
Interrupt the processor can not reject
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
PC
Personal computer
PCI
Peripheral Component Interconnect
High-speed expansion bus
PCMCIA
Personal Computer Memory Card
International Association