The communication protocol is designed in term of three layers: Physical layer, Media Access Control layer and LogicLinkControl layer.
本通信协议分为物理层、介质访问控制层和逻辑链路控制层三层设计。
2
All Programmable Logic Controllers (PLC) and Processors shall use Object Link Embedded (OLE) process control (OPC) protocol to facilitate communication to a central control and data processing system.