After installing CSWorks, many of you are tempted to connect it to your OPC data source. Here is a quick step-by-step guide how you can do that in five minutes.
In this example, I will assume we are dealing with Matrikon OPC Simulation Server - you can download it for free from Matrikon website. After installing Matrikon components, you can start tweaking CSWorks Pipes and Tank Demo so it uses data from Matrikon OPC Server.
Add new data source to LiveData Service configuration
Add a few lines to C:\Program Files\CSWorks\Framework\Server\CSWorks.Server.LiveDataService.exe.config:
<opcLiveDataSources type="CSWorks.Server.DataSource.Opc.OpcLiveDataSource, CSWorks.Server.OpcProvider">
...
<opcLiveDataSource name="OpcMatrikon" sampleBufferLength="16" hostName="localhost" progId="Matrikon.OPC.Simulation.1" subscriptionUpdateRate="250">
<templates>
<template name="matrikonBoolTag" type="Boolean" readPath="Random.Boolean" canWrite="true"/>
</templates>
</opcLiveDataSource>
</opcLiveDataSources>
Restart LiveData Service so your changes take effect and the service connects to the data source.
Add new data source to LiveData Server topology configuration
Add one line to C:\Program Files\CSWorks\Demo\Web\LiveDataWebService\web.config:
<liveDataTopology>
<liveDataPartitions>
<liveDataPartition name="partition1" primaryLiveDataServer="liveDataServer_1_primary" secondaryLiveDataServer="">
<dataSources>
...
<dataSource name="OpcMatrikon"/>
</dataSources>
</liveDataPartition>
</liveDataPartitions>
</liveDataTopology>
Now LiveData Web Service knows where to get data for OpcMatrikon data source.
Modify demo application
Run Microsoft Visual Studio and open Pipes and Tanks Demo project at C:\Program Files\CSWorks\Demo\Src\PipesAndTanksDemo\PipesAndTanksDemo.Sample.csproj. Let's make several additions to the Page.xaml file.
Add a new data item that gets data from the boolean tag configured for Matrikon OPC Server:
<UserControl.Resources>
...
<d:BoolDataItem x:Key="TestValve" Id="type in new guid here" DataSource="OpcMatrikon" TemplateName="matrikonBoolTag" Parameters=""/>
</UserControl.Resources>
Add a few visual elements to the upper left corner of the screen and bind them to the new data item:
<controls:TabControl...>
<controls:TabItem Header="HMI Controls View">
<Canvas>
...
<Grid ...>
...
</Grid.ColumnDefinitions>
<pipes:RightValve Grid.Row="0" Grid.Column="3" IsOpen="{Binding Value, Mode=OneWay, Source={StaticResource TestValve}}" OpenColor="Black" ClosedColor="Black" IsEnabled="False" Margin="-16,0,16,0"/>
<PipesAndTanksDemo:Wireframe Grid.Row="0" Grid.Column="3" Status="{Binding Status, Mode=OneWay, Source={StaticResource TestValve}}" Margin="-16,0,16,0"/>
<pipes:RightTWay Grid.Row="0" Grid.Column="2" IsFilled="{Binding Value, Mode=OneWay, Source={StaticResource TestValve}}" FillColor="Coral" Margin="-16,0,16,0"/>
<PipesAndTanksDemo:Wireframe Grid.Row="0" Grid.Column="2" Status="{Binding Status, Mode=OneWay, Source={StaticResource TestValve}}" Margin="-16,0,16,0"/>
...
Now we have a valve and a t-way joint that supply some coral-colored liquid to Tank 1. Also, we have added a couple of Wireframe elements that will tell us if something is wrong with Matrikon boolean tag.
Time to tell DataManager that we have a new data item. Add a command to the Page_Loaded() handler in Page.xaml.cs:
void Page_Loaded(object sender, RoutedEventArgs e)
{
...
dataManager.DataItems.Add(Resources["TestValve"] as DataItem);
Do not forget to update the id of the datamanager in the Page.xaml, otherwise LiveData Service will keep using cached list of required data items and Matrikon tag value will never be returned:
<d:DataManager x:Key="DataManager" Id="type in new guid here" />
We are done. Build client application and run it at http://localhost/CSWorksDemo/PipesAndTanksDemo.html (or click Start menu and choose All Programs -> CSWorks -> Client Samples -> Pipes and Tanks Demo). The left upper corner of the screen will have some new visual elements - see screenshot.
Security Issues
In the case of Matrikon Simulation OPC Server, we did not have any issues with COM/DCOM security, because Matrikon installer lets everyone access this OPC Server. You can verify it by running dcomcnfg.exe tool and checking out Matrikon Simulation OPC Server configuration - it explicitly says that "Everyone" has "Launch and Activation" and "Access" permissions for this component, see screenshot.
This cannot be considered safe practice, but makes casual user's life a bit easier. Not all OPC server providers write installers that allow the whole world to access their components. In some cases, you may get notorious "Access Denied" COM/DCOM error 0x80070005 when CSWorks accesses OPC server. Stay tuned - there will be a post dedicated to COM/DCOM security.