List of abbreviations and acronyms
SIMATIC MV420 / SIMATIC MV440
404 Operating Instructions, 04/2013, A5E02371045-06
Abbreviation/symbol Explanation
ESD Electrostatic Discharge
FB Function Block
FBD Function Block Diagram
GND Ground
GSD Generic Station Description
IAQG International Aerospace Quality Group
I/O Input/Output
ISO International Standards Organization (from Greek: "isos": "equal")
IEC International Electrotechnical Commission
IEEE Institute of Electrical and Electronics Engineers
IP Internet Protocol or International Protection
HF High Frequency
H
2
S Hydrogen sulfide
hPa Hectopascal
HR High Resolution
HTML Hypertext Markup Language
HTTP Hypertext Transfer Protocol
kg Kilogram
LAD Ladder Diagram
LAN Local Area Network
LCD Liquid Crystal Display
LED Light emitting diode
MAC Media Access Control
max. Maximum
MB = Mbit 10
6
bits
MHz Megahertz
mils milli-inches
min Minute
m Meter
mm² Square millimeter
MTBF Mean operating Time Between Failures
MTTR Mean Time To Recover
LF Low Frequency
OCR Optical Character Recognition
OCV Optical Character Verification
PC Personal Computer, a stationary single-user computer
PELV Protective Extra Low Voltage
PG Programming device
PIB Proxy Ident Function Block
PROFIBUS Process Field Bus, international fieldbus standard to EN 50170/IEC 61158
PTB Physikalisch-Technische Bundesanstalt (German technical inspectorate)
RAM Random Access Memory
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