They are only used in special situations. You should rarely have to touch these permissions.
Configuration – these permissions allow a remote client to change the configuration of the OPC servers’ setup in the registry.For example, our TOP Server OPC server EXE is "servermain.exe". There are 2 common EXEs that get launched: (1) OPCEnum.exe, a standard OPC common component that lists the available OPC servers on a machine and returns that list to a client and (2) the actual EXE that corresponds to the OPC server. Launch – these permissions are what allows an OPC client application to start or "launch" an EXE running on the machine where the OPC server is located.If you use these types of reads, sometimes called "subscription" or "exception" reads, then it is important that Access permissions be set right on the client machine. A callback occurs when you ask the OPC server to notify your client only when data changes.
They also allow the OPC server to make what is known as a "callback" to your client. Access – these permissions allow a client machine to connect to a server computer, retrieve a list of OPC servers and connect to a server.The following are some common types of permissions for DCOM. This article is only intended to point out some key setups to configure a DCOM connection between an OPC client and an OPC server.
If there are not permissions set both ways then the machines will not successfully connect. The client must have permissions to access the machine with the OPC server and vice versa. You can also add existing users to this group.Setting up a DCOM connection between two computers requires that both computers have permission to access each other. You can create several users and add them to one "DCOM Users" group. To allow the new user to work with DCOM, you should add the user to the corresponding "DCOM Users" group. The password must be specified and must not be empty. 2 Access to the computer or server management console Further on you should run the OPC client using this user account.įig. You need to have administrator permissions to add a user.Īttention! You need to create users with the same name and password on both computers (where the server and the client are installed). To increase security, you can create a user with restricted permissions. You need to create a user that has permissions to run and use DCOM applications. Creating a user and giving access permissions 2.1 Adding a user Configuring the Windows 2008 and Windows 7 firewall for DCOM and OPC. Creating a user and giving access permissions. OPC and DCOM Configuration on Windows 2008 and Windows 7
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