Design and Function


The SIMATIC S7-400 is available in several versions:

  • S7-400:
    The power PLC for the mid to high-end performance ranges with modular, fan-free design.

  • S7-400H:
    Fault-tolerant automation system with redundant design for fail-safe applications.

  • S7-400F/FH:
    Fail-safe automation system with redundant design that can also have high availability.

A host of features support users in programming, commissioning and servicing the S7-400:

  • High-speed instruction execution.

  • User-friendly parameter assignment

  • Human machine interfacing:
    User-friendly OCM services are already integrated into the operating system of the S7-400.

  • Diagnostics functions and self-test:
    The intelligent diagnostics system of the CPUs continuously checks the functional capability of the system and registers faults and specific system events.

  • Password protection

  • Mode selector.

  • System functions.

  • The SIMATIC S7-400 complies with national and international standards inter alia IEC 61131-2, marine approvals, CE mark and many others