OPC server

On this node, you can adjust the parent settings for using the OPC DA interface.

There is a separate configurations dialog for OPC UA.

OPC DA ("classic" OPC) uses the DCOM protocol for communication. Please note the following information:

Note

Due to a vulnerability in the DCOM protocol, Microsoft has released security update KB 5004442, which was activated in the final stage on March 14, 2023, and affects the connectivity of OPC components.

With the activation of the new security feature, only DCOM connections (network connections) between OPC servers and clients that support packet-based authentication are possible. Communication between OPC Classic servers and clients running on the same computer is not affected.

Detailed information about the effects of KB 5004442 DCOM security update is available on the Microsoft website (https://support.microsoft.com/en-us/topic/kb5004442-manage-changes-for-windows-dcom-server-security-feature-bypass-cve-2021-26414-f1400b52-c141-43d2-941e-37ed901c769c)

iba AG does not provide support for problems with OPC Classic remote network connections. Depending on the application, there is also the option of communicating via OPC UA instead, thereby avoiding communication via DCOM.

You can enable and disable the OPC server here. The disabled status is indicated by an icon (white cross on red circle) in the tree on the left.

Only the number of the maximum permissible OPC clients that can be connected to ibaPDA at the same time must be set at this point.

This setting serves to prevent overloading the resources of ibaPDA by too much OPC communication. The default setting is 64. Only increase the value when absolutely necessary.

The other fields show different actual values for OPC communication.

In addition, you have the option to suppress OPC alerts.

Note

The tags in the OPC server will be updated like outputs of ibaPDA. Thus, the fastest update cycle derives from the least common multiple of all module time bases or is at least 50 ms respectively.

All other settings for the OPC communication are made in the interface and modules.

Also see part 3, OPC interface.

Also see part 3, OPC Client module.

Also see part 3, Redundant OPC client module.

Also see part 3, OPC Server module.