Why am I getting the error: 'Access denied.' on MatrikonOPC Data Manager? Answer / Solution Make sure Data Manager is running. Make sure your DCOM Authentication Level is set to Connect. Make sure Data Manager's DCOM settings allow the OPC Server for ODM's user (SYSTEM if running as system) to connect to it.
Why is my OPC server being denied launch/access?
Thus, it is possible Windows will deny access either because the ACL does not include the necessary permissions for a user account, or because that user account is explicitly denied from receiving launch/access rights. If either of these is the case, you must change the ACL for the OPC server.
What are the challenges of OPC on remote computers?
The first challenge is browsing for available OPC servers on remote computers. Browsing is the process whereby OPC client applications view a list of OPC servers on a remote computer. When applications browse, they connect to a copy of OpcEnum, which resides on the remote computer, and retrieves the list of available OPC servers.
Why is opcenum not installed on my computer?
OpcEnum is typically installed when you install an OPC client or OPC server; but, this is not always the case. It is possible a computer does not have a local copy of OpcEnum installed. The most common errors are 0x80040153 and 0x80040154. In such cases, OPC Expert will enable you to repair this problem automatically by installing OpcEnum.
Does opcenum require anonymous logon access?
By default, OpcEnum requires Anonymous Logon access (on the OPC server computer). If you do not provide this access, no one will be able to connect to OpcEnum and browse the computer. It is possible this access was overlooked during the setup. You can also configure OpcEnum so it does not require Anonymous Logon access.
What is OPC error?
It can be a standard error code defined in the OPC specifications, or a custom error code defined by the server vendor. Errors from the COM/DCOM infrastructure, either on the computer where the OPC Classic server runs, or on the client computer. Errors detected on the client side and generated by QuickOPC.
What is DCOM and OPC?
OPC technology relies on Microsoft's COM and DCOM to exchange data between automation hardware and software; however it can be frustrating for new users to configure DCOM properly. If you have ever been unable to establish an OPC connection or transfer OPC data successfully, the underlying issue is likely DCOM-related.
What is OPC enum?
OPCEnum is a program that scans your registry for a list of OPC Servers on your computer OPCEnum needs to be able to run on the computer where it resides. Therefore, ensure to check Run application on this computer. Security Tab. There are 3 options on the Security tab that need to be set. Launch Permissions.
What is OPC driver?
An OPC Driver is a software application, that has been written to one of the OPC Specifications. An OPC Driver will respond to requests, and provide data to one or more OPC Clients in a standard, consistent manner.
How do I connect to remote OPC server?
If you use OPC DA, you have to do OPC DCOM settings. And if you are connecting to the remote PC, make sure you have the same user name in both local and remote machine and this user have rights to access the OPC enum service. Check this link, it contains all the details related to opc remote settings.
How do I connect to OPC server?
1.3. Connect to an OPC serverRight click on the OPC DataHub system-tray icon and choose Properties.In the Properties window, select OPC .Check the Act as an OPC Client box. ... Type in or select the necessary information as appropriate. ... Click the Apply button in the Properties Window.
How do you test for DCOM?
1 From the Windows Start menu, choose Run.2 Type dcomcnfg in the box, and then click OK.3 In the left frame, expand Component Services and then Computers.4 Right-click My Computer and choose Properties.5 On the Default Properties tab, check that Enable Distributed COM on this computer is selected.6 Click OK.
How do I set up DCOM?
Click on the Windows Start button, and select Run and then type “dcomcnfg” to open the DCOM configuration dialog box. Navigate inside the Console Root folder to the Component Services folder and then to the Computers folder. Finally, you will find the My Computer tree control inside the Computers folder.
Where is the OPCEnum located?
Where is OPCEnum.exe installed and what do I do if I can't find it?Most OPC servers install it in \Windows\System32 and properly register it. The OPC ActiveX Data Control also installs a copy in this location.
What is OPC used for?
Open Platform Communications (OPC) is an interoperability standard for the secure exchange of industrial automation data. It is designed to be platform-dependent so devices from different vendors can exchange information.
Why is OPC needed?
An OPC server reduces the load on data source devices as it enables communication with several applications, while having only one connection with the data source. This reduces multi-access from the data source, and hence reduces the load on the data source.
What is an OPC connection?
OPC is a software interface interoperability standard that allows secure and reliable exchange of data between Windows programs and industrial hardware devices. It is platform-independent and ensures the continuous flow of information across multiple vendor devices.
What is OPC used for?
Open Platform Communications (OPC) is an interoperability standard for the secure exchange of industrial automation data. It is designed to be platform-dependent so devices from different vendors can exchange information.
What does DCOM stand for?
Distributed Component Object ModelDCOM is an acronym that stands for Distributed Component Object Model. DCOM is a proprietary Microsoft software component that allows COM objects to communicate with each other over the network.
What is DCOM in Windows?
The Distributed Component Object Model (DCOM) is a protocol that enables software components to communicate directly over a network. Previously named "Network OLE," DCOM is designed for use across multiple network transports, including Internet protocols such as HTTP.
Does OPC UA use DCOM?
Since OPC UA doesn't rely on DCOM, you can network OPC UA over the internet and through firewalls much more efficiently and reliably.
5.1 RPC server unavailable
This error means that it is impossible to establish a network connection to the RPC service.
5.2 Access denied
This error means that the current permissions are not enough to establish a connection. You should configure DCOM as described in section 4.
5.3 IOPCServerList interface not found
You should restart the computer after you install the OPC Core Components.
How to ensure OPC connection is secure?
To ensure that an OPC connection is secure, create users and groups that are exclusively for this use. These can be manually added by any user who has the proper credentials to do so.
What is OPC server?
The OPC server stores OPC specific information in the registry. Since OPC clients need to be able to discover servers running on both the same machine and remote machines, there needs to be a standard method for accessing this registry information (which is not available for remote access). To do so, a component called OPCEnum is provided by the OPC Foundation. OPCEnum is an executable that is typically installed on a computer along with the OPC server. It runs as a System service and provides a means to browse the local machine for OPC servers and then expose the list to the OPC client.
What should be considered before DCOM?
Before DCOM is configured on the server computer, both the level of security and the Runtime's process mode should be considered. To provide the highest level of security, users must enable the appropriate settings. The process mode should be chosen since the DCOM configuration is reset when the process mode is changed.
Why is DCOM enabled?
This option, which is enabled by default, ensures that DCOM settings are obeyed and user authentication is performed. Disabling the option is not recommended since the server will impersonate the security of the client when performing any actions on behalf of the client application.
What is a DCOM?
Distributed Component Object Model (DCOM) is an extension of Component Object Model (COM) that allows COM components to communicate among objects on different computers. DCOM uses Remote Procedure Call (RPC) to generate standard packets that can be shared across a network, which in turn allows COM to communicate beyond the boundaries of the local machine.
