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If the OPC Client application is unable to find the CLSID, for any reason, it will not be able to connect to the OPC Server and use any of the messages in Section "2 Symptoms" (above).
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Consequently, the retrieval of the list is independent of the state of each OPC Server and whether it is operational or not.įigure 1: OpcEnum is used to browse for OPC Servers that are located on the same PC as OpcEnum.
![kepware kepserverex failed to connect kepware kepserverex failed to connect](https://img.yumpu.com/37317115/1/500x640/kepserver-connectivity.jpg)
At this point, the OPC Client does not actually connect to the OPC Servers directly. This list includes the ProgID (human friendly name) and the CLSID (the numerical identification) of each OPC Server. When the OPC Client performs a Browse, it actually connects to a copy of OpcEnum, which resides on the remote PC, and retrieves the list of available OPC Servers (refer to Figure 1). This process is called Browsing, and is the process whereby the OPC Client application is able to view the OPC Servers that are installed on the remote PC. Most OPC Client applications attempt to display a list of available OPC Servers on the target PC. A CLSID is similar to your own government-issued identification, such as a Social Security Number (SSN) or Social Insurance Number (SIN), which identifies a specific person.
![kepware kepserverex failed to connect kepware kepserverex failed to connect](https://img.automationworld.com/files/base/pmmi/all/image/2014/07/aw_26135_oas507_kepware_kepserverex_5_15_logo.png)
The CLSID is a type of Globally Unique Identifier (GUID), which is a 128-bit number that identifies an application. Each OPC Server is identified by a Class Identification (CLSID). When an OPC Client application tries to connect to an OPC Server, the OPC Client application must be able to identify the exact application (OPC Server) to which it will connect. The inability to establish the first connection with an OPC Server is both the first and most common error that Integrators encounter when using OPC.
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Depending on the software product that you are using, this error may appear in various different formats as follows: When an OPC Client application is unable to find the OPC Server, users receive an error informing them that the OPC Client application could not obtain the CLSID of the OPC Server.
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![kepware kepserverex failed to connect kepware kepserverex failed to connect](https://xrgo.io/wp-content/uploads/Kepware-logo.png)
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![kepware kepserverex failed to connect kepware kepserverex failed to connect](https://image.slidesharecdn.com/transcendautomationkepwareopcproducts-090722134432-phpapp02/95/transcend-automations-kepware-opc-products-1-728.jpg)