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Developing OPC HMI for a Web Browser

Developing OPC HMI for a Web Browser. Colin Winchester VP Operations Nathan Pocock Chief Architect & Developer. Developing OPC HMI for a Web Browser. You may private chat with the host here. Ask questions to panelists here. Developing OPC HMI for a Web Browser.

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Developing OPC HMI for a Web Browser

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  1. Developing OPC HMI for a Web Browser Colin Winchester VP Operations Nathan Pocock Chief Architect &Developer

  2. Developing OPC HMI for a Web Browser You may private chat with the host here Ask questions to panelists here

  3. Developing OPC HMI for a Web Browser While we are sharing applications, the toolbar shown below appears in the bottom right corner of your screen. You can access Chat with Host and the Q&A with Presenters Panels by clicking on the icons as shown. Private Chat with Host Q&A with Panelists

  4. Developing OPC HMI for a Web Browser Agenda – 60 Minutes • Overview of Web based HMI’s • Overview of the OPC DataHub • Live Demonstration • Overview of OPCSystems.NET • Live Demonstration • Additional Information • Questions & Answers

  5. OPC to BrowsersWhy? • Availability • Everyone has a browser • Everyone knows how to use one • Avoid special software installs, sometimes • Portable Access • Cell-phone based web browsers • Handheld devices • Network Access • Standard transport protocols = firewall friendly • Usually can handle slower connections better than a “thick client” application • Administration & Development • Single application updates all clients • Development is easier than ever!

  6. Web-App Capabilities • Display data from OPC Servers • Get user-input for writing to OPC Items • Trending/Charting live OPC Data • Alarm displays and acknowledgements

  7. Secure access? Example Configurations Single Server SolutionOPC Systems Tag RepositoryOPC Server?Web ServerWeb Application GREEN ZONE Browsersinside the network FirewallFirst-line of defense from outside world. Browsersoutside the network

  8. Example Configurations OPC Clusterhigh availability for your OPC Server(s) and/or OPC Systems .NET Tag Repository Web Server Clusterhigh availability for your Web HMI application(s) GREEN ZONE Tolerance Achieved: OPC Layer Web Servers

  9. Web Challenges • Security/Networking • Controlling the number of connections to the server • Controlling access • Firewall • Password • Encryption of data (SSL) • Speed – data update rates • Aren’t the fastest at executing client side code • Aren’t good at remembering “state” or “where I’ve been” • Cookies, query strings attempt to work around this! • Wide variety of versions and service pack levels

  10. OPC DataHubFunctionality Overview OPC to Web System Monitoring http://www.softwaretoolbox.com/opcdatahub

  11. OPC DataHub HMI Client What can you do? System Data PC uptime Running processes Memory usage Multiple & Varied Data Sources Web Server

  12. OPC Servers (1 to N)Local or Remote/Tunneled Standard Web Browsers on Desktop or Mobile Devices OPC DataHub Processing of data in DataHub on Server Side and value inserted into HTML web page OPC to Web MethodsASP – Active Server Pages • Webserver reads some “live” or active data one time, and puts it into the web page • No client side plug-ins or ActiveX required • Easy to implement • Easy on system resources – client and server • Requires page reload to refresh data • Good for reports or one-shot, one-off data needs

  13. OPC to Web MethodsAJAX Polling • Asynchronous Javascript And XML • Provides live updates in the browser without a page reload • No plug-ins or ActiveX required • Polling -Mediocre Update Speeds – faster than ASP • Can consume a lot of client & server side resources • Used in web monitoring and troubleshooting applications OPC Servers (1 to N)Local or Remote/Tunneled Standard Web Browsers on Desktop or Mobile Devices OPC DataHub Processing of data happens on client and client polls the WebServer for data

  14. OPC to Web MethodsAJAX Streaming • Asynchronous Javascript And XML • Provides live updates in the browser without a page reload • No plug-ins or ActiveX required • Streaming – Very fast updates – similar to Java applets • Can consumes less resources then polling • Used in remote monitoring and diagnostic systems OPC Servers (1 to N)Local or Remote/Tunneled Standard Web Browsers on Desktop or Mobile Devices OPC DataHub Processing of data happens on client and client polls the WebServer for data

  15. OPC Servers (1 to N)Local or Remote/Tunneled OPC Servers (1 to N)Local or Remote/Tunneled Standard Web Browsers w/ Java on Desktop PCs only Standard Web Browsers w/ Java on Desktop PCs only OPC DataHub OPC DataHub Method #1 Method #2 IIS or Apache WebServer serves up web pages DataHub WebServer serves up web pages OPC to Web MethodsJava Applets • Java Applets are another alternative • Very, very fast update rates • Very thrifty on server and client side compared to AJAX • Speed of AJAX with thriftiness of ASP • But you will have to allow the Java Applets to install • Used in process control systems for monitoring and HMI displays

  16. Developing OPC HMI for a Web Browser • Live Demo • OPC DataHub with ASP • OPC DataHub with AJAX • Polling • Streaming • OPC DataHub with Java Applets

  17. Summary of Web Methods

  18. Web Development Changed • Code-less, no more learning “languages” • AJAX delivers dynamic pages, no reload • Winform/Webform development = same! • Easy debugging with Visual Studio.NET • Live OPC data in the Browser is now Easy!

  19. Simple screens with few graphics Data response can be slow Restrict access to users/groups Must be accessible Inside/outside LAN Desktop, Laptop, Phone etc. High-speed data (sub 1-second) Large quantities of data on-screen. High concurrent user # with above. Continuous process control / monitoring Web-HMI, does it make sense? When it makes sense Not a good fit!

  20. * While OPC UA is not yet released, OPC Systems .NET was one of the first to implement OPC UA back in 2006 and will support OPC UA once the OPC Foundation releases the necessary Tools. OPC Systems .NET Benefits OPC Systems .NET provides these benefits: • Central “always-on” tag repository = faster performance • Tag data can come from OPC DA, UA* and/or Databases • Multi-Threaded for faster, and more Reliable operations • Buffers data, eliminating data-loss for short outages as well as maximizing the performance of your web-link • Modular, components available separately or as a suite • Affordable, not as expensive as you might think • OPC Self-Certified, for assurance in quality

  21. AJAX Polling Data Source OPC Server PLC DCS Other How it works… • Tag repository stores Data, and some history • Data can come from OPC Servers (DA, UA etc.) • OPC Connection is always ON eliminating connectivity overhead • Browsers see OPC Data when page opens • Async polling retrieves data to be shown in page, no refresh! OPC Systems .NETService(Tag Repository)

  22. AJAX Polling Data Source OPC Server PLC DCS Other How it works… • Browser requests an “update” of the items/tags it needs. • OPC Systems .NET Server responds with values that have changed: • If value remains same, empty data-set returned • If 1-value changed, that value is returned • If the value changed multiple times, all updates sent OPC Systems .NETService(Tag Repository)

  23. Live Demo • Create a multi-page Web Site • Use Visual Studio .NET 2005 Master Pages • Display some (almost) real-time data • Simple Form Controls • Charting page • Alarm display and acknowledgement page

  24. OPC Systems .NET Service(Tag Repository) Queue Queue Queue Local Network Internet Client Application Client Application Client Application Tolerance • Tag Repository individually “caches” data to each client • If a client goes temporarily offline, it will “catch-up” on the next update. • Applies to ALL OPC Systems .NET Clients(data logging, alarms, WinForms, WebForms etc.)

  25. Other Features Available • Data Logging (text files and databases) • Report generation • Alarm logging and notification • Windows Forms development tools • Recipe management • Lightweight HMI developer studio

  26. Summary • Convenience: Quickly and easily build & deploy HMIs • Scalable Framework: allowing your system to grow • Reliable: OPC Self-Certified, plus Buffering • Alerting: Data Logging, Reporting, Alarming & Notifications • Open: API provides interface for your apps to control • Affordable: modular, buy what you need.

  27. More Information … get through to an expert! Visit www.softwaretoolbox.com/webinars for future events Questions: Nathan Pocock: Email: npocock@softwaretoolbox.com Tel: +1 (704) 708-6482 www.softwaretoolbox.com/opcsystems Colin Winchester Email: cwinchester@softwaretoolbox.com Tel: 704-849-2773 x1327 www.softwaretoolbox.com/opcdatahub Technical Support: Tel: +1 (704) 849-2773 Web: http://support.softwaretoolbox.com

  28. Affordable • License the entire system for just $1,995.00 • No OPC Server Connection or Tag Counts • No Client counts at the OPCSystems Service • No Text File or Database Connection Counts • Code-less development tools are Runtime-free • Fully documented, lots of examples • SmartClient Technology ready

  29. $995 $3750 What Tools are Needed?ASP or AJAX Polling Scenario • Unlimited # of client connections • OPC bridging, scripting, aggregation & Excel connections are included! • No license limits on # of OPC items you access! • No Server Operating system required

  30. $995 $595/ea $3750 What Tools are Needed?AJAX Streaming and Java Applets w/DataHub WebServer • No Server class Operating System Needed! i.e. Run on Windows XP • TCP/Link Licenses are concurrent connection licenses • DataHub other features included! • No license limits on # of OPC items you access!

  31. $995 $595/ea $3750 What Tools are Needed?Java Applets w/IIS or Apache WebServer • IIS or Webserver may be free, but will require IT involvement • IIS is not really “free” – requires a Server Grade Operating System • And, IIS & Apache present much bigger attack surface • TCP/Link Licenses are concurrent connection licenses • OPC bridging, scripting, aggregation & Excel connections included! • No license limits on # of OPC items you access! IIS or Apache WebServer serves up web pages

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