If you open an existing project and the NCU is grayed out, the Toolbox version likely doesn't match the project version. Ensure V17 is correctly installed.
Use the "Sinumerik 840D sl Basic Program" library included within the toolbox installation. Sinumerik 840d Sl Step 7 Toolbox V17 Download
Windows 10 (64-bit) or Windows 11, depending on your TIA Portal V17 update level. If you open an existing project and the
The installer will automatically detect your TIA Portal V17 installation. Sinumerik 840d Sl Step 7 Toolbox V17 Download
Right-click the .exe file and select "Run as Administrator."