The SIMATIC S7-400H is used to avoid downtimes. As a member of the well-tried SIMATIC S7 family, it is based on standard components. The SIMATIC S7-400H provides the highest level of availability thanks to its redundant configuration, and can be as easily programmed as a standard system. All modifications can be made in online mode. In such cases, both CPUs are automatically updated. The CPUs can be expanded by adding ET 200M or S7-400 signal-modules.

Overview of further highlights:

• Easier handling:
  Most redundancy-relevant functions are hidden from the user
  
• Easier parameter initialization:
  The parameters for redundancy-specific functions and configurations can be comfortably assigned using the STEP 7 option package
  
• Easier programming:
  SIMATIC S7-400H is programmed in the same way as a non-redundant standard system
  All standard programming languages, that can be used for the SIMATIC S7, can also be used here without restriction
  
• Easy porting:
  The program for non-redundant systems can be easily ported for redundancy and vice versa

• Faster system configuration and commissioning
  • Better system integration
    • Uniform engineering for standard and redundant control component
    • Use of existing PROFIBUS cables even for redundant communication
    • Full integration in PCS 7 - integrated process control system for high availability
  • Faster commissioning
    • Full concentration on the actual automation task in comparison with conventional redundant solutions because redundancy-specific functions are executed automatically by the operating system
• Retention of the highest level of plant availability
  • Early fault detection thanks to better diagnostic functions
  • Automatic switch-over to redundant hardware in the case of a hardware failure without any loss of data
  • Support of redundant I/O