| Step | Update Pack | Fixed Compatibility Issues | | :--- | :--- | :--- | | 1 | | Windows 10 21H1 DPI scaling on 4K monitors. | | 2 | WinCC 7.5 SP2 Update 3 | Critical. Adds Server 2022 support. Fixes SQL deadlocks on NVMe drives. | | 3 | WinCC 7.5 SP2 Update 6 | Latest stable (as of 2025). Resolves WebUX certificate expiration. |
: Product discontinuation and cancellation for V7.5 SP2 are currently slated for October 2027 .
Do not upgrade an existing WinCC 7.4 (SQL 2014) database directly to SQL 2017. You must use the Project Migrator tool included in SP2. Direct SQL detachment/reattachment will corrupt the archive logging. wincc 75 sp2 compatibility list best
If you plan to operate more than three WinCC clients connected to a server, you must use a Windows Server operating system (Windows 10 only supports up to 3 simultaneous client connections). The best-supported server OS versions for WinCC 7.5 SP2 are:
| PLC Family | Required Driver Channel | Max. Connections (Best Practice) | | :--- | :--- | :--- | | | SIMATIC S7-1500 Channel (native TCP/IP) | 64 | | S7-1200 (FW 4.5) | S7-1200 Channel | 32 | | S7-300/400 | SIMATIC S7 Protocol Suite > TCP/IP | 128 | | Legacy S5 | SIMATIC S5 - 3964R or TF (via CP 5611) | 8 | | Step | Update Pack | Fixed Compatibility
Even with the best compatibility list, issues arise. Here is the field guide.
Tip: Configure your antivirus to exclude the WinCC installation folders and SQL Server directory from real-time scanning to maximize performance. 🛠️ SIMATIC Software Coexistence Fixes SQL deadlocks on NVMe drives
While Windows 11 was not natively supported at the initial release of 7.5 SP2, later updates (specifically Upd7+) have increased compatibility. However, Windows 11 Pro 24H2 is generally the highest approved version for 7.5 SP2, whereas 25H2 and later are often not officially approved for this specific version. 2. SQL Server Compatibility
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: While original V7.5 versions were not compatible, WinCC V7.5 SP2 and higher officially support Windows 11 Pro and Enterprise.
| Product | Compatibility & Recommendations | | :--- | :--- | | | Fully Compatible: With V15.1, V16, and V17 | | SIMATIC S7-1200 / S7-1500 PLCs | Fully Compatible via "SIMATIC S7-1200, S7-1500 Channel" | | SIMATIC S7-300 / S7-400 PLCs | Fully Compatible (Industrial Ethernet / Profibus) | | Legacy S5 / S7-200 PLCs | Likely Compatible via "SIMATIC S5 Ethernet" / Profibus; requires dedicated hardware | | WinCC WebNavigator | Fully Compatible for web-based clients |