You can use the DataHub program to convert data between the OPC UA and OPC DA protocols. A DataHub instance can connect to any number of OPC UA and/or DA servers or clients, and keeps a copy of all of their registered points in a single, universal data set. Each connected server or client can access that whole data set, and yet sends or receives data value updates in its own protocol.
You can configure OPC UA to DA conversion as follows:
Configure the appropriate OPC UA server or OPC DA server connections.
Configure the appropriate OPC UA client or OPC DA client connections to access the data from any or all OPC UA or DA servers.
If all of your connections are client-server connections, that may be all that is needed. However, if you need to make server-server connections, one more step is necessary
Configure DataHub Bridging for any server-server connections.