The CPU 412-5H has:

• 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 F/FH 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 F/FH, which is why it requires about twice as much memory space. 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 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 enables a distributed automation configuration with high speed and simple handling. From the user's point of view, the distributed I/Os are treated like centralized I/Os (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/Os are treated like centralized I/Os (same configuring, addressing and programming).
• PROFINET interface with 2 ports (switch):
  Support of system redundancy and MRP (Media Redundancy Protocol)
• Mode selector:
  Designed as a toggle switch.
• Diagnostics buffer:
  The last 120 alarm 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.