在OPC UA中解耦控制平面和数据平面.pdf

1、Jim Luth System Architect,Process Automation R&DOPC Foundation CTO,UA Working Group Chairman,TAC Member,TCB MemberJim.LuthSE.com /jim.luthopcfoundation.org2Decision-making and management Planning routes,setting schedules,managing resources.The actual operations Planes taking off and landing,cars mov

2、ing on roads,people going about their day.Networking infrastructure faces a similar challenge Traditionally,these two functions were tightly coupled,but now they are separated.The Brain of the Network Responsible for high-level decision-making.Key Functions Routing:Determining the best path for data

3、 packets.(Think of a GPS system)Signaling:Establishing and maintaining connections.(Like setting up a phone call)Policy Enforcement:Implementing security rules and quality of service.(Traffic lights and speed limits)Network Management:Configuring and monitoring network devices.(Air traffic control)E

4、xamples Routing protocols(OSPF,BGP),signaling protocols(SIP),network management protocols(SNMP,NETCONF).3The Muscle of the Network Responsible for the actual forwarding of data packets.Key Functions Forwarding:Moving packets from an input interface to an output interface.(The actual roads and runway

5、s)Packet Processing:Performing actions on packets(e.g.,applying QoS markings).(Checking tickets or tolls)Focus High-speed,efficient,and reliable data transmission.(i.e.moving the in-band data)Examples Ethernet switching,IP forwarding and routing.45678No distinction between control and data All contr

6、ol and data services use the Client/Server SessionHow would it be split?Data plane=streamed real-time data using efficient encoding(UA binary)and Report-By-Exception Control plane=everything else(Browse,Read,Write,Query)to access the UA Address Space9Message E