Siemens PLC
Siemens offers a variety of controllers for a wide range of automation needs. The range of SIMATIC controllers includes basic, advanced, distributed controllers and software that has significant scalability and integrated performance. Siemens PLCs are divided into the following 6 categories. Mini PLCs or LOGO, S7-200 (out of production), S7-300, S7-400, S7-1200 and S7-1500. SIMATIC S7-300 PLCs will be available at least until 2020 and have been tested and proven as a fixed controller.