http://www.onoff-group.de/en/memberships/opc-foundation/

The Industrial Interoperability Standard

The OPC Foundation is responsible for the development and maintenance of these standards and works as a global organization in which users, vendors and consortia work together. The aim is to create data transmission standards for secure and reliable interoperability in industrial automation with multiple vendors and multiple platforms.
The uniform standards ensure that current requirements relating to industry 4.0 and IT security are taken into account.

About OPC Foundation.