UA Architecture and Roadmap. Presented by Kepware

Transcription

1 UA Architecture and Roadmap OPC Fundamentals Presented by Kepware

2 The Most Popular OPC of All 2

3 Overview How to Access Data? The Issues of Data Access Introduction to OPC-DA (Data Access) Overview of common OPC-DA Features Quick OPC-DA Demonstration Questions

4 And the Survey Says How many access data from devices? How many of you know what OPC is? How many of you are using OPC technology? Do you feel comfortable with OPC technology?

5 Data Access Basics Ethernet Data Historian RS-232 s drivers bridge the gap between applications and devices

6 s Ethernet Data Historian s RS-232 Physical Connections RS-232 RS-485 RS-422 Ethernet Protocols Modbus RTU Data Highway Plus Profibus Ethernet/IP drivers know the physical connection and protocol for the device

7 Things to Remember drivers bridge the gap between applications and devices drivers know the physical connection and protocol for the device (Very Important Point) drivers gather the data based on the demands of the applications s

8 The API Nightmare Vendor A Vendor A Vendor A Vendor B Vendor B Vendor B Vendor B Vendor C Vendor C Vendor C Vendor C Vendor A Each Vendor has their own driver API (Application Programming ) Customers could not mix or use drivers from multiple vendors, no Interoperability

9 An API to Unite All (OPC-DA) Customers and Vendors came together, the OPC Foundation is formed The goal, develop a single API for all Use the Latest technologies available Allow both local and remote access Ensure Interoperability

10 The API Dream Vendor A O P C Vendor A Vendor A O P C Vendor B Vendor B O P C Vendor B Vendor B O P C Vendor C Vendor C O P C Vendor C Vendor C O P C Vendor A Each Vendor now using OPC DA as common interface (Data Access) Customers can now mix and use drivers from multiple vendors, complete Interoperability

11 Data Access System Refresher Ethernet Ethernet/IP Data Historian Modbus RTU RS-232 OPC DA s OPC DA now provides the glue between the applications and the driver, the device connections and protocol remain the same.

12 OPC DA Under the Covers Based on Microsoft s COM (Component Object Model) It is a Client/Server architecture COM provides the basic framework OPC defined the actual functions of DA (Data Access) COM allowed for remote access using DCOM (Distributed COM)

13 Client/Server and OPC DA Ethernet/IP Ethernet Modbus RTU OPC DA Client Side Defined as the OPC Client The Client Consumes data services The Server Provides data services COM is the Middle Man Microsoft COM OPC DA Server Side s Defined as the OPC Server OPC Servers and Clients in most cases are separate programs now OPC Servers only act on commands from an OPC Client

14 Key Features of OPC DA Provide browsing for OPC Servers on PCs Provide browsing of data tags available in Servers Provide data tag group management Provide standard Read functions for data tags Provide standard Write functions for data tags Provide standard method of data conversion and translation of data tags Provide robust error handling and reporting on all functions and device status

15 Browsing for OPC Servers Similar to locating PCs on your Network Allows OPC servers on both Local and Remote PCs to be located Allows the OPC client to locate specific versions of OPC servers OPC Client OPC Server A OPC Server B OPC Server C OPC Server D OPC Server E OPC Server F

16 Browsing for OPC Data Tags Allows data tags to be located like browsing for files on a hard drive OPC Servers can use Branches similar to Folders to group similar Data Tags for easier representation to users Browse filtering simplifies the task of locating tags in large applications Browse Functions OPC_ServerRoot\ + _Cell1\ OPC Server O P C HMI OPC Client Cycle_Count Cycle_Time + Temperatures\ Zone1_Temp Zone2_Temp

17 OPC Tag Group Management Data Tags can be placed in groups within the OPC server by the OPC client Groups can be turned on and off by the OPC client The update rate on a group controls how often data is read from the device OPC Sever with Tag Group Physical Link to device Group1 (1000ms) Cycle_Count Cycle_Time Zone1_Temp Zone2_Temp

18 OPC DA Refresher OPC DA is a Client/Server architecture based on Microsoft COM (Component Object Model) OPC Servers and OPC Clients are now primarily standalone applications OPC Clients control the OPC Servers OPC DA functions allow OPC Servers, and Data Tags to be browsed and listed Ethernet/IP Ethernet Modbus RTU OPC DA Client Side Microsoft COM OPC DA Server Side s Defined as the OPC Client Defined as the OPC Server OPC DA allows data tags to be managed in Groups OPC Server O P C Browse Functions HMI OPC Client OPC_ServerRoot\ + _Cell1\ Cycle_Count Cycle_Time + Temperatures\ Zone1_Temp Zone2_Temp

19 OPC DA Data Read Functions Read Data via Synchronous I/O Reading from Device or Cache Read Data via Asynchronous I/O Reading Data Tag properties

20 OPC Synchronous Reads OPC Server HMI Group1 Cycle_Count Cycle_Time Zone1_Temp Zone2_Temp Device Read OPC Client Data Synchronous Reads stop the OPC Client The Client is stopped until the data is returned from the device

21 OPC Asynchronous Reads OPC Server Group1 Cycle_Count Device Read Cycle_Time HMI Zone1_Temp Zone2_Temp OPC Client Data Asynchronous Reads allow the OPC Client to keep running while the server gathers the data The OPC server returns the data via a data callback to the OPC Client

22 OPC DA Data Write Functions Write Data via Synchronous I/O Blocks the OPC Client like Synchronous reads Write Data via Asynchronous I/O Like the Asynchronous reads, the write allows the OPC Client to continue to run Both write operations will return error codes to confirm the write operation has succeeded or failed.

23 OPC DA Data Reliability OPC DA servers supply the Current Value of a device or process tag Status on the Quality of the tag Timestamp of the time the tag was read

24 Multiple - Clients, Servers, Rates OPC Client OPC DA Link OPC Server Proprietary Links OPC Server OPC Client OPC Server As a Client/Server architecture based on Microsoft s COM, OPC allows multiple OPC Clients to talk with multiple OPC Servers simultaneously

25 Things to Remember Ethernet/IP Modbus RTU Ethernet OPC DA Client Side Microsoft COM OPC DA Server Side s Defined as the OPC Client Defined as the OPC Server OPC DA is Client/Server OPC Server side wraps the communications drivers of old OPC Client side wraps the applications, HMI.. etc. Microsoft's COM is the middle man OPC DA provides a rich set of functions to browse/ read/ and write device data OPC DA Provides robust error handling and reporting OPC DA Allows multiple vendor applications to be developed Always use Asynchronous operations if possible

26 Quick OPC DA Demonstration How to connect to an OPC Server using an OPC Client How to browse for data Adding data tags to a Group Group Update Interval Looking at changing data Writing data Error detection

27 Questions? Roy Kok VP Sales and Marketing 27