The SIMATIC Panel PC is also available with pushbutton control fronts key in addition to touch control fronts. You can use labeling strips to label the F and S keys yourself (notes on changing the labeling strips are available in the device manual). Transparent, printable strips are available as accessories (order number: 6AV7672-0DA00-0AA0). You can print the labeling strips with the following templates for the 12" and 15" front panels.
Labels, Labeling strips