The CPU 417-4 features:

• Powerful processor:
  The CPU achieves command execution times as low as 0.018 µs per binary instruction.
• 32 MB work memory (of which 16 MB each for program and data);
  faster work memory for sections of the user program that are significant for execution.
• Flexible expansion capability:
  Up to 262 144 digital inputs/outputs and 16 384 analog inputs/outputs
• MPI multi-point interface:
  With the MPI it is possible to establish simple networking of max. 32 stations at a data transmission rate of up to 12 Mbps. The CPU can establish up to 44 connections to stations of the communication bus (C‑bus) and the MPI.
  Note:
  If the PROFIBUS DP interface and MPI interface are operated simultaneously, it is only possible to connect the following bus connectors to the MPI interface:
  • With socket: 6ES7 972-0BB42-0XA0
  • Without socket: 6ES7 972-0BA42-0XA0
• Mode selector switch:
  Toggle switch design.
• Diagnostic buffer:
  The last 120 fault and interrupt events are retained in a ring buffer for diagnostic purposes (expandable).
• Real-time clock:
  Diagnostic alarms of the CPU are tagged with the date and time.
• Memory card:
  For expanding the integrated load memory. The information in the load memory comprises S7‑400 parameterization data in addition to the program and therefore requires twice as much memory space. The result is:
  • The integral load memory is not sufficient for large programs, therefore a memory card is frequently required.
    RAM and FEPROM cards (FEPROM for retentive storage) are available
• PROFIBUS DP interface:
  The PROFIBUS DP master interface allows a distributed automation configuration offering high speed and ease of use. From the user's point of view, the distributed I/O is treated as central I/O (same configuring, addressing, and programming).
  Mixed configuration: SIMATIC S5 with SIMATIC S7 as PROFIBUS master according to EN 50170.
  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 972-0BB42-0XA0
  • Without socket: 6ES7 972-0BA42-0XA0
• Two additional slots:
  Two additional PROFIBUS DP master systems can be connected via IF 964-DP interface modules.