PN/M-Bus LINK 
Operating Instructions, 03/2018, A5E44260928-AA 
57 
AR (Application Relation) 
S7 connection for data exchange in PROFINET 
CI Field (Control Information Field) 
DIF (Data Information Field) 
FE (functional grounding) 
Low-impedance connection to ground potential 
GSDML (General Station Description Markup Language) 
GSDML is a language for describing PROFINET IO field devices. This language is used to 
create a GSD (General Station Description). 
OSS (Open Source Software) 
Open Source Software (OSS) is software that meets the definition of the Open Source 
Initiative (OSI), for example, that this software is subject to one of the Open Source Software 
licenses recognized by OSI. 
PROFINET (Process Field Network) is the open Industrial Ethernet standard of the 
PROFIBUS User Organization for automation. 
RoHs (Restriction of certain Hazardous Substances) 
EU Directive 2011/65/EU restricts the use of certain hazardous substances in electrical and 
electronic devices.