The CPU 412-1, CPU 412-2 and CPU 412-2 PN are equipped with the following:

• Powerful processor:
  The CPUs achieve instruction execution times as low as 0.75 µs per binary instruction.
• CPU 412-1: 512 KB main memory (of which 256 KB each for program and data);
  CPU 412-2: 1 MB main memory (of which 512 KB each for program and data);
  CPU 412-2 PN: 1 MB main memory (of which 512 KB each for program and data);
  fast main memory for parts of the user program relevant to execution.
• Flexible expansion:
  Up to 65536 digital and 4096 analog inputs/outputs.
• Multi-point interface MPI:
  The MPI allows a simple network to be established with up to 32 stations and a data transmission rate of up to 12 Mbps. The CPUs can establish up to 16 connections to stations of the communication bus (C bus) and the MPI.
• Mode selector switch:
  Designed as toggle switch.
• Diagnostics buffer:
  The last 120 fault and interrupt events are retained in a ring buffer for diagnostic purposes. The number of entries can be parameterized.
• Real-time clock:
  The date and time are appended to diagnostic messages of the CPUs.
• Memory card:
  For expansion of 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 sufficiently large, so a memory card is often not required.

The CPU 412-2 also features:

• PROFIBUS DP interface and combined MPI/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 and SIMATIC S7 as PROFIBUS master according to EN 50170.