The CPU 417-4H features:

• A powerful processor:
  The CPU achieves command runtimes as little as 18 ns per binary command.
• 30 MB main memory (15 MB for programs, 15 MB for data):
  Load memory for user programs and configuration data for the S7-400H automation system; Fast main memory for subroutines of the user program that are relevant to the process.
• A memory card:
  For expanding the integrated load memory. In addition to the program itself, the information contained in the load memory also includes configuration data for the S7-400H, which is why it takes up twice as much space in the memory. The result is that:
  • The integrated load memory is not sufficient for large programs, which is why the memory card is often required.
    RAM and FEPROM cards are available (FEPROM for saving at zero voltage too).
• Easy expandability:
  Max. 128K digital and 8K analog inputs/outputs.
• Multipoint-capable MPI interface:
  The MPI enables the creation of a simple network with max. 32 nodes and a data transfer rate of 187.5 Kbit/s. The CPU can establish up to 64 connections to users of the communication bus (C bus) and the MPI.
  Note:
  If PROFIBUS DP and MPI interfaces are being used simultaneously, only the following bus connectors can be connected to the MPI interface:
  • With socket:6ES7 972-0BB41-0XA0
  • Without socket:6ES7 972-0BA41-0XA0
• Mode selector:
  Designed as a toggle switch.
• Diagnostics buffer:
  The last 120 alarm and interrupt events are stored in a ring buffer for the purpose of diagnosis.
• Real-time clock:
  Diagnostics reports from the CPU are provided with the date and time.
• PROFIBUS DP interface:
  The CPU 417-4H with PROFIBUS DP master interface enables distributed automation to be established at high speed and with easy operation. From the user's point of view, the distributed I/Os are treated like centralized I/Os (same configuration, addressing and programming).
  Note:
  If PROFIBUS DP and MPI interfaces are being used simultaneously, only the following bus connectors can be connected to the MPI interface:
  • With socket:6ES7 972-0BB41-0XA0
  • Without socket:6ES7 972-0BA41-0XA0