Siemens commonly used PLC models and characteristics

Complete list and introduction of Siemens commonly used PLC models

LOGO and S7-200 are ultra-compact PLCs, suitable for single-machine control or small system control, applicable to various industries and automatic detection, monitoring, and control in various scenarios.

S7-300 is a modular small PLC system, which can be used for direct control of equipment and can monitor multiple subordinate programmable controllers. It is also suitable for controlling medium or large control systems, meeting the requirements of medium performance applications.

s7-300 is designed for small to medium-sized systems, and its modules can be expanded up to 32 modules. The backplane bus is integrated within the modules. Its network connections are mature and popular, supporting MPI and Industrial Ethernet, making communication and programming simpler. It offers a wide range of options and can be configured and parameterized using various tools.

s7-400: The main difference from the S7-300 lies in the hot restart (WRST) feature; otherwise, they are quite similar. It also has an external battery power interface to provide backup power to RAM when replacing the battery online.

S7-1200 is a compact PLC and an upgraded version of S7-200. It features modularity, a compact structure, and comprehensive functionality, making it suitable for various applications, ensuring the long-term security of existing investments.

S7-1500 is a new generation large to medium-sized PLC with significant improvements in various indicators compared to S7-300/400. It is designed for high-end equipment and factory automation, providing abundant resources, ultra-fast computing speed, excellent system performance, and integrated features, including motion control, industrial information security, and safety functions for convenient and secure applications.