ad 1. The achievable fastest update rate depends on many factors. You therefore need to test it out. You should not require updates faster then you need, that would only put unnecessary load on various parts of the system. The actual default in the demo app is 50 milliseconds. The lowest acceptable number is 1 milliseconds but I think it is quite unrealistic.

ad 2. I do not understand the question. The example already processes the item changed events for a given time.

Best regards

I don't think you are reading the documents I am referring you to. The list of assemblies to be installed, and the list of assemblies to be registered, are given there.

Here is a copy from the Concepts doc:

Assemblies (.NET)

Depending on which assemblies you have referenced in your application, you may need one or more of the following files be installed with your application:

• App_Web_OpcLabs.EasyOpcClassicRaw.amd64.dll
• App_Web_OpcLabs.EasyOpcClassicRaw.x86.dll
• OpcLabs.BaseLib.dll
• OpcLabs.BaseLibForms.dll
• OpcLabs.EasyOpcClassic.dll
• OpcLabs.EasyOpcClassicForms.dll
• OpcLabs.EasyOpcClassicInternal.dll
• OpcLabs.EasyOpcUA.dll
• OpcLabs.EasyOpcUAForms.dll

Please refer to “Product Parts” chapter for description of purpose of individual assemblies. You will find them under the Assemblies\net452 subdirectory in the installation directory of the product.

The assemblies need to be placed so that the referencing software (your application) can find them, according to standard Microsoft .NET loader (Fusion) rules. The easiest is to simply place the assembly files alongside (in the same directory as) your application file.

There are other methods of how assemblies can be located, including their installation to GAC (Global Assembly Cache). Which method you use depends on the needs of your application. Unless you have a compelling need, however, we do not recommended installing the assemblies into the GAC.

COM Components and Development Libraries

Because QuickOPC-COM and QuickOPC-UA for COM are implemented by exposing the .NET objects of QuickOPC to COM, you need to basically do two things:

1. Deploy the assemblies needed for .NET (see preceding chapter).
2. Register them using the Assembly Registration tool (Regasm.exe)

The Assembly Registration tool is a part of .NET Framework, and is therefore available on every computer that has the .NET Framework installed. You only need to apply the Assembly Registration tool to the following assemblies:

• OpcLabs.BaseLib.dll
• OpcLabs.BaseLibForms.dll
• OpcLabs.EasyOpcClassic.dll
• OpcLabs.EasyOpcClassicForms.dll
• OpcLabs.EasyOpcClassicInternal.dll
• OpcLabs.EasyOpcUA.dll
• OpcLabs.EasyOpcUAForms.dll

For more information, please refer to msdn.microsoft.com/en-us/library/tzat5yw6(v=vs.110).aspx . It is recommended that you use the /codebase option when registering the assemblies.

Prerequisites

Besides the actual library assemblies, QuickOPC requires that following software is present on the target system:

1. Microsoft .NET Framework 4.5.2.

Needed when: Always.

In some special cases, you may want to install other prerequisites – please refer to “Prerequisites Boxing” under “Advanced Topics”.

Licensing

Proper license (for runtime usage) must be installed on the target computer (the computer where the product will be running). The License Manager utility is needed for this. It is contained in LicenseManager.exe file, located under the Bin subdirectory in the installation directory of the product.

As described in the Application Deployment section of the Concepts, on the production machines you can either install QuickOPC - you can select the Custom install and install only for Production (COM), or you can deploy the assemblies and COM components yourself, using the described procedures.

Have you done these steps? Specifically, have you performed RegAsm on the assemblies, as described in the documentation? Did they work without errors? If there were errors, what exactly were they?

If there were no errors during the deployment, what are the details of the exception you are getting?

Hello.

Is there any simulator for OPC XML DA server to add my own sample tags for demo XML da server(opcxml.demo-this.com/XmlDaSampleServer/Service.asmx)?

It is not possible to add tags to our demo server for OPC XML-DA.

Deploying sample app in multiple machines are supported? or How I can handle this situation?

I do not quite understand what you are asking about. The issues that have to do with installing the applications developed with QuickOPC are descriebd in the Concepts document, section "Application Deployment". If there is something in ti that you do not understand, please ask a specific question.

Best regards