OPC UA vs OPC Classic (DA)
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The Founder's Explanation (Teach Exactly This Way)
"An old machine that only runs on one company's electricity — every time that company changes the socket, your machine stops. That was OPC Classic, tied to Windows DCOM. OPC UA is a universal adaptor — runs anywhere, through any firewall, on one clean plug. That is why people move off the old one; it keeps breaking on every update."Teaching the Concept
The Machine Tied to One Socket Imagine a machine that only runs on one company's special socket. Every time that company changes the socket, your machine stops. That was OPC Classic, chained to Windows DCOM. OPC UA is the universal adaptor that runs anywhere. UA is the migration path off a fragile, locked technology. Side by Side ``` OPC CLASSIC (DA) OPC UA COM / DCOM (Windows) platform-independent fragile, firewall-hostile firewall-friendly (one port) no built-in security certificates + encryption Windows-locked any OS, embedded to cloud ``` Why Teams Migrate ``` DCOM pain breaks on OS/security updates firewalls DCOM needs many ports; UA needs one security Classic has none native; UA is secure by design ``` OPC UA is OPC set free from Windows DCOM — portable, secure and firewall-friendly where Classic was locked.Related Topics
- What is OPC UA in BMS and when is it needed? — when to reach for OPC UA
- What is a protocol in BMS? — the shared language controllers use to talk
- Browse all Protocols topics — more from this section of the EnSmart BMS Library
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