: New I/O devices can be run in Simulation Mode for testing before physical hardware is connected. Persist Mode saves variable values to the hard disk, ensuring they are immediately available upon system restart.

| Problem | Solution | |---------|----------| | | Usually a missing VC++ Redistributable. Install all versions from 2012 to 2022. | | Cannot connect to SQL Server | Enable TCP/IP in SQL Configuration Manager and open port 1433 in Windows Firewall. | | Web client shows blank page | Ensure IIS is installed with ASP.NET 4.8 and WebSocket Protocol. | | Licensing error -100 | The license file is for a different hardware ID. Regenerate the license. | | Slow graphics refresh | Disable Windows animations and enable “Hardware Acceleration” in Citect Graphics settings. |