STEP 7 MicroWIN is a powerful software for programming Siemens S7-200 series PLCs. PLCs in this family are usually used to control, monitor and guide industrial devices at medium levels, and since it is part of the low-cost PLCs of this company, it is widely used in small and medium industries. These types of PCs have various communication facilities including Ethernet, CP, PPI and… communication. It has 6 to 24 onboard inputs and outputs and has a dedicated monitoring system called TD.