Siemens SIMATIC NET PROFIBUS manual Abbreviations, Iso/Osi

Abbreviations 10

DIN	Deutsche Industrie Norm (German industrial standard)
ESD	Electrostatic discharge
EN	European standard
EMC	Electromagnetic compatibility
FO	Fiber–optic
IEEE	Institute of Electrical and Electronic Engineers
ISO/OSI	International Standards Organization / Open System
	Interconnection
HCSt	HCSt is a registered trademark of Ensign–Bickford
	Optics Company and stands for
	“Hard Polymer Cladded Silica Fiber”.
	In these instructions, only the
	general term PCF is used.
LAN	Local Area Network
LED	Light Emitting Diode
OBT	Optical Bus Terminal
OLM	Optical Link Module
PCF	Polymer Cladded Fiber, synonymous with HCSt fiber
POF	Polymer Optical Fiber; synonymous with plastic FO cable
PROFIBUS DP	PROFIBUS Distributed I/Os
SELV	Safety extra–low voltage
UL	Underwriter Laboratories
VDE	Verein Deutscher Elektroingenieure (association of
	German electrical and electronics engineers)

PROFIBUS Optical Bus Terminal (OBT)	10-1
C79000-G8976-C122-02