SIMATIC S7-300 programmable logic controller is a modular small and medium-sized PLC system that can meet the needs of medium-performance applications. It has a wide range of functional modules that can meet and adapt to automatic control tasks very well. The simple and practical distributed structure and multi-interface network capabilities make the application very flexible. It also has a user-friendly and simple fanless design, as well as the freedom to expand when the control task increases.
The catalog presents the SIMATIC S7-300 programmable controller as a modular PLC system for industrial automation. It describes the central processing unit, digital and analog I/O modules, function modules, communication processors, power supplies, and accessories, highlighting the system's flexibility, expandability, and compliance with international standards.
Detailed sections cover connection methods, interface modules, HMI options, software tools, configuration appendices, and a quick‑reference ordering table. Technical specifications for individual modules such as digital input SM321 and digital output SM322 are listed, and the document includes training information and a user survey form. This manual is written in Chinese.
| Rated input voltage (SM321) | 24V DC (20.4‑28.8V) |
|---|---|
| Maximum modules per rack | 8 modules per rack, up to 32 modules on 4 racks |
A maximum of 8 modules can be placed in each rack, allowing up to 32 modules across one central rack and three extension racks.