This document provides an overview of the SIMATIC S7 automation system from Siemens. It describes the various hardware and software components that make up the SIMATIC S7 family including SIMATIC controllers like S7-200, S7-300, and S7-400, programming devices, and the STEP 7 configuration software. Pictures and diagrams are included to illustrate the different modules, components, and how they interconnect as part of the SIMATIC S7 programmable logic controller system.