16 AC800M_OPC通讯连接.pdf

System 800 xA TrainingChapter 16-1Chapter 16 OPC ConnectivityTABLE OF CONTENTSChapter 16 OPC Connectivity.116.1 General Information.216.1.1 Objectives.216.1.2 Legend.216.1.3 Reference Documentation.216.2 OPC Communication.316.2.1 OPC Standard.316.2.2 Structure and Data Flow.416.2.3 MMS Server.516.2.4 OPC Terms.516.2.5 Controller CPU Load.616.2.6 AfW OPC Service Model.616.3 OPC Server Configuration.816.3.1 Setting up Data Access Connection.816.3.2 Setting up Alarm and Event Connection.916.3.3 Loading Configuration Automatically at Startup.1016.4 OPC Configuration in System 800 xA.1116.4.1 Setting up OPC Data Access Connectivity.1116.4.2 Setting up OPC Alarm and Event Connectivity.1316.5 Saving Cold Retain Values.1716.5.1 Control Builder and OPC Server.1716.5.2 File Locations.1816.6 Check OPC Connectivity.1916.6.1 Check Control Object Properties.1916.6.2 Check the System Services.2116.6.3 Controller Diagnostic.2216.7 Name Uploader.2316.7.1 Problem Description.2316.7.2 Names and Description Parameters.2416.7.3 Running the Name Uploader.25Chapter 16-216.1 General Information16.1.1 ObjectivesOn completion of this chapter you will be able to:Describe communication structure and data flowSet up OPC connectivityVerify communication(live data)Explain the Name Uploader16.1.2 LegendIndicates when you go from one menu to a sub-menuItalicIndicates object and file names“Indicates dialog box buttons,tabs,menus etc.BoldIndicates important topicsIndicates start/explanation of student activity16.1.3 Reference Documentation3BSE041880System 800 xA ControlAC 800M Getting Started3BSE035983AC800MOPC Server3BSE041434System 800 xASystem Guide Technical Data and Configuration3BSE043732AC800MPlanningSystem 800 xA TrainingChapter 16-316.2 OPC Communication16.2.1 OPC StandardOPC stands for OLE for Process Control.OLE(Object Linking and Embedding)is aMicrosoft technology for objects to interact with each other.OLE is based on COM orDCOM.OLE allows placement of“embedded objects”and“linked objects”in a document thatretains the native data used to create them(or a“link”to that data)as well as formatinformation.In simpler terms,the clipboard metaphor of cut,copy,and paste.A double-click allowed the object data to be automatically brought back into theoriginal editor.The OPC Foundation is a non-profit corporation that has established a set of standardOLE/COM interface protocols advancing interoperability between automation/controlapplications,field system/devices and business/office applications in the processcontrol world.While OLE was originally designed for office applications(e.g.Word,Excel).OPCtechnology is an extension of that protocol for industrial applications.NOTE!OPC is an open standard.www.opcfoundation.orgOPC provides a mechanism to provide data from a data source and communicate thedata to any client application in a standard way.OPC is a group defined protocol for process control data communication.It has threeinterfaces as follows:OPC Data Access for real time dataOPC Alarm and Event for event dataOPC Historical Data Access for historical dataChapter 16-416.2.2 Structure and Data FlowThe OPC Server for AC 800M is needed for reading run-time data or alarms andevents from controllers.The OPC Server for AC 800M consists of the following parts:OPC Data Access ServerThe OPC Data Access Server provides data from controllers programmed withControl Builder through an OPC Data Access 2.0 and 1.0A interface.OPC Alarm and Event ServerThe OPC Alarm and Event Server generate a stream of information,mostly eventnotifications,and distribute them to the Alarm and Event clients.OPC Alarm andEvent 1.02 standard is supported.AspectServerConnectivityServerThe OPC Server must be installed in the same physical node as the ConnectivityServer.There are a number of basic rules that applies:One OPC Server is allowed to subscribe to data from a maximum of 24 PM861controllers,or the equivalent number of variables from other controller types.A maximum of three OPC Servers are allowed to subscribe to Data Access and/orAlarm and Event from one controller.Multiple OPC Clients can subscribe to data or event notifications from the sameOPC Server.A third-party OPC Client should,if possible,be installed on the same PC as theOPC Server.System 800 xA TrainingChapter 16-516.2.3 MMS ServerThe MMS Server resembles a switchboard between the OPC Server and the ControlNetwork.The server is automatically installed when the Control Builder,or the OPCServer is installed,so no further action is required.MMS stands for“Manufacturing Message Specification”and is an ISO 9506 standard.For further information look at: protocol defines communication messages transferred between controllers as wellas between the engineering station(such as Control Builder)and the controller(e.g.downloading an application or reading/writing variables).It has been developed especially for industrial applications.The protocol can be usedon many different networks,but preferably on the TCP/IP network。