It is assumed that basic concepts of OPC UA information modelling and IO-Link are understood in this specification. This specification will use these concepts to describe the OPC UA for IO-Link Information Model. For the purposes of this document, the terms and definitions given in OPC 10000-1, OPC 10000-3, OPC 10000-4, OPC 10000-5, OPC 10000-7, OPC 10000-100, IO-Link Specification, and IODD Specification as well as the following apply.