Defined connection point of a functional unit which can be connected to other functional units

Note 1: “Defined” means that the requirements and the assured properties of this connection point are described.

Note 2: The connection between the interfaces of function units is also called an interface.

Note 3: In an information system, the defined exchange of information takes place at this point.

Note 4: An nterface places certain requirements on the connection that is to be made.

Note 5: An interface demands certain features.


  • ISO/IEC 13066-1:2011(en), 2.15
  • DIN EN 60870-5-6:2009-11
  • DIN IEC 60625-1:1981-05