. OPC Unified Architecture Part 15: Safety. Release 1.04. 2019-10-31. , OPC Foundation, 2019.

This technical specification constitutes Part 15 of the OPC Unified Architecture (OPC UA) standard series and defines the OPC UA Safety communication protocol and services that meet functional safety requirements. The document details the safety communication layer based on the "Black Channel" approach, data structures (RequestSPDU and ResponseSPDU), error detection mechanisms (Monitoring Number, Timers, Identifiers, and CRC-32 checks), as well as the interactions between the Safety Provider and Safety Consumer, diagnostic methods, and the information model.