Siemens makes several PLC product lines in the SIMATIC S7 family. They are: S7-200, S7-1200, S7-300, S7-400, S7-1500. Siemens Step 7 is a powerful integrated software solution for automation, and includes the programming environment for Siemens programmable logic controllers (PLCs). This software provides unique and powerful programming tools with multiple benefits including: creation of re-useable logic, a structured program architecture, and single project integration of multiple automation devices.