The CPU 412-5H features:

• A powerful processor:
  The CPU achieves command execution times as low as 31.25 ns per binary command.
• 1 MB RAM (512 KB for program, 512 KB for data);
  load memory for user programs and parameterization data of the S7-400H automation system; high-speed RAM for sequence-relevant sections of the user program
• 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 around twice as much space in the memory. The result is:
  • The integrated load memory is not sufficient for large programs, which is why a memory card is often required.
    RAM and FEPROM cards are available (FEPROM for saving data even when power supply is disconnected).
• Flexible expansion options
  Up to 131 072 digital and 81 932 analog inputs/outputs
• Combined MPI/PROFIBUS DP interface:
  The MPI enables the creation of a simple network with up to 32 nodes and a data transfer rate of 187.5 kbit/s. The CPU can establish up to 64 connections to nodes on the communication bus (C bus) and the MPI.
  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 handled like the centralized I/O (same configuring, addressing and programming).
• PROFIBUS DP interface:
  The PROFIBUS DP interface allows a redundant, distributed automation configuration offering high speed and ease of use. From the user's point of view, the distributed I/O is handled like the centralized I/O (same configuring, addressing and programming).
• PROFINET interface with 2 ports (switch):
  Supports system redundancy and MRP (Media Redundancy Protocol)
• Mode selector:
  Toggle switch design.
• Diagnostics buffer:
  The last 120 error and interrupt events are stored in a ring buffer for diagnostic purposes.
• Real-time clock:
  Diagnostics reports from the CPU are provided with the date and time.