OPC UA 2018年最新的所有资料，资料内容如下：
OPC UA Companion Specification Template v1.0.9.docx
OPC UA IEC 61850 Companion Specification.pdf
OPC UA Part 1 - Overview and Concepts Release 1.04 Specification.pdf
OPC UA Part 2 - Security Model Release 1.04 Specificatio
