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| ardiextra:moving_to_opc_ua [2023/11/28 00:34] – created optrix | ardiextra:moving_to_opc_ua [2025/12/18 22:50] (current) – external edit 127.0.0.1 | ||
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| + | ====Moving from OPC-DA to OPC-UA==== | ||
| + | The OPC-DA standard was very progressive for its time, but in the modern era it has a few significant problems. | ||
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| + | This is why the OPC Foundation has replaced the old standard with **OPC-UA**, a more modern equivalent. | ||
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| + | There are several significant advantages of UA over DA, including... | ||
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| + | * OPC-DA depends on D-COM, a Windows only component that is very complex to administer, often fails after Windows updates, and is being actively phased out by Microsoft. UA does not. | ||
| + | * OPC-UA is cross-platform, | ||
| + | * OPC-UA has it's own security layer, rather than depending on Active Directory | ||
| + | * OPC-UA has finer-grain security controls, less overhead and some modern extensions that improve the system overall. | ||
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| + | If you're working with older systems, you can use an **OPC-UA Wrapper** - a product that effectively upgrades your DA server to a UA one. Since this can run on the same server as your OPC-DA machine, avoid all of the complexity of DCOM and allows much easier access to your data. | ||