Siemens S7 PLCs Windows Programming Software Version 7 Price: US$925.00 Part Number for Ordering: 41278102 Availability: In Stock - Ships in 0 to 1 days. Media: CD and/or Online Delivery S7 for Windows provides an efficient and straightforward programming system for the entire Simatic® S7-300® and S7-400® PLC-control series. The complete S7-instruction set is implemented in the Statement List (STL), Function Block Diagram (SFC) and Ladder Diagram (LAD) presentations. This software can be combined with S5 for Windows® or runs stand alone.