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The S7-400 is the most powerful PLC in the SIMATIC Controller family; the range that enables successful automation solutions with Totally Integrated Automation. The S7-400 is an automation platform for system solutions in the manufacturing and process industries, and is distinguished above all by its modularity and performance reserves.


  • Automotive industry (e.g. assembly lines)
  • Machine building, including special machine building
  • Paper and printing industry
  • Food and beverages industry
  • Woodworking
  • Chemical industry and petrochemicals
  • Process engineering, e.g. water supply, waste water treatment
  • Steel industry
  • Power generation and distribution and more

The S7-300 CPU spectrum covers following CPU variant:


An S7-400 system consists basically of a backplane, a power supply, and a CPU. The system is modular and can be set up easily without the need to observe slot rules. The S7-400 is characterized by rugged fan-free operation with hot swapping of signal modules.

A diverse range of modules can be used both for centralized expansions and for easy setup of distributed structures with the ET 200; this results in extremely low-cost spare parts inventory.

S7-300 Family
S7-400 Family

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SIMATIC S7-400 Product Overview- Siemens Brochure
SIMATIC S7-400 Page - Siemens Website
Siemens AG Automation and Drive (A&D) - Search Page for any of Siemens A&D products including FAQ, manual, download software tools etc.
SIMATIC Technical Documents Page - Website Siemens
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