. OPC Unified Architecture Part 15: Safety. Release 1.05.00. 2021-11-10. , OPC Foundation, 2021.

This specification defines the requirements for ensuring safety communications (Safety Communication Layer – SCL) in industrial automation systems. In accordance with the IEC 61508 and IEC 61784-3 standards, the document describes OPC UA-based mechanisms (Safety Provider, Safety Consumer, MNR, CRC, etc.) designed to detect and mitigate communication errors—such as data corruption, loss, delay, repetition, and addressing errors—that may occur in lower-level networks.