Siemens S7 400 Programmable Logic Controller

The siemens s7 400 is the most powerful PLC in the family of SIMATIC controllers. It enables successful automation solutions with Totally Integrated Automation (TIA). The S7-400 is an automation platform for system solutions that focuses on process engineering and is characterized primarily by its modularity and performance reserves.

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  • Conformal coating (G3) as standard for increased resistance to environmental influences
  • High-availability automation system with redundant design
  • For applications with high fail-safety requirements:
  • Processes with high restart costs, expensive downtimes, little supervision, and few maintenance options.
  • Redundantly designed central functions
  • Increases availability of I/O: switched I/O configuration
  • Also possible to use I/Os with standard availability: single-sided configuration
  • Can be used with versatile, scalable SIMATIC ET 200SP HA I/O system via STEP 7
  • Hot standby: Automatic reaction-free failover to the standby unit in the event of a fault
  • Configuration with 2 separate or one divided central device
  • Connection of switched I/O via redundant PROFIBUS DP or system-redundant



  • Automotive industry, e.g. assembly lines
  • Mechanical equipment manufacture, including special mechanical equipment manufacture
  • Warehousing technology
  • Steel industry
  • Building management systems
  • Power generation and distribution
  • Paper and printing industry
  • Woodworking
  • Food and beverages industry
  • Process engineering, e.g. water and wastewater utilities
  • Chemicals industry and petrochemicals
  • Instrumentation and control
  • Packaging machinery



General technical data

Degree of protection


Ambient temperature

0 to 60 °C

Relative humidity

5 to 95%, no condensation

Atmospheric pressure

1080 to 795 hPa (corresponds to an altitude of -1000 m to +2,000 m)

Electromagnetic compatibility

  • Interference immunity

According to EN 61000-6-2

  • Emitted interference

According to EN 61000-6-4

Mechanical load

  • Vibration, test according to / tested with

IEC 60068-2-6 (sine)

10 to 58 Hz; constant amplitude 0.075 mm;
58 to 500 Hz; constant acceleration 1 g; duration of oscillation: 10 frequency sweeps per axis in each direction of the three mutually perpendicular axes

  • Shock, test according to / tested with

IEC 60068-2-27
Type of shock: Half-sine;
strength of the shock 10 g (peak value), duration 6 ms
direction of shock: 100 shocks in each of the 3 mutually perpendicular axes.