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• 15:43, 10 December 2025 User talk contribs created page OPC Q&A (Created page with "= Are subscriptions and asynchronous operations similar? = Both OPC subscription, and OPC asynchronous reads/writes require a callback from the OPC server to the OPC client. In this sense, they are quite similar, and a subscription can be considered a special case of the asynchronous OPC communication. The asynchronous read/writes, however, are "one-shot" transactions, initiated individually by the OPC client. The subscription is created inside the OPC server by the OP...")