For air-gapped (offline) industrial networks, Siemens still sells physical USB flash drives or DVDs. Contact your local Siemens distributor with order number (WinCC V7.5 SP2 RT/RC combo).
| Feature | WinCC V7.5 SP2 | WinCC Unified (TIA Portal) | | :--- | :--- | :--- | | | Large, legacy, or process plants | New, web-centric, mid-size machines | | Tag Limit | 262,144 tags | 4,096 tags (as of V19) | | Runtime | Windows-only | Windows, Linux, Embedded | | Web Clients | WebUX (HTML5) | Native HTML5/JavaScript | | Learning Curve | Steep (classic Windows UI) | Modern (similar to Visual Studio) |
WinCC V7.5 SP2 does NOT support Windows 11 or Windows Server 2025. Do not attempt installation on unsupported OS versions.
You might see links on forums or third-party blogs. While tempting, downloading SCADA software from non-official "posts" is risky because: