The SIMATIC S7-300 programmable logic controller is a modular small to medium-sized PLC system suitable for applications with medium performance requirements. It features a wide range of functional modules and a decentralized structure, making it flexible for various automation tasks. The controller has a user-friendly design and supports multiple interface networking, providing convenience for users. It also supports easy expansion and offers powerful functionality, making it a robust controller.
The Siemens S7-300 product catalog presents the full range of programmable controller hardware, including CPUs, digital and analog I/O modules, function modules, communication processors and power supplies. It details the modular architecture, installation options and the extensive feature set for industrial automation.
The document also provides ordering information, technical specifications for each module, connection methods, and a quick‑reference ordering table, helping engineers select the right components for their control systems. This manual is written in Chinese.
| SM 321 Input voltage range | 24V DC 20.4‑28.8 V |
|---|---|
| SM 322 Output voltage range | 24V DC 20.4‑28.8 V |
| Communication interfaces | PROFIBUS‑DP, MPI, AS‑Interface, Industrial Ethernet, point‑to‑point |
The S7‑300 supports PROFIBUS‑DP, MPI, AS‑Interface, Industrial Ethernet and point‑to‑point links via communication processors.