The CPU 414-3 PN/DP is equipped with the following:

• Powerful processor:
  The CPU achieves command execution times as low as 0.045 µs per binary instruction.
• 4 MB RAM (of which 2 MB each for program and data);
  fast RAM for parts of the user program relevant to execution.
• Flexible expansion:
  Up to 131072 digital and 81932 analog inputs/outputs.
• Multi-point interface MPI:
  With the MPI it is possible to establish simple networking of max. 32 stations at a data transmission rate of up to 12 Mbit/s. The CPUs can establish up to 32 connections to stations of the communication bus (C bus) and the MPI.
• Mode selector switch:
  Designed as toggle switch.
• Diagnostics buffer:
  The last error 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 for large programs is not sufficient, therefore a memory card is frequently required. RAM and FEPROM cards (FEPROM for retentive storage) are available.
• 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.
• Additional module slot:
  An additional PROFIBUS DP master system can be connected via the IF 964-DP interface module.
• PROFINET interface with 2 ports (switch):
  
  • PROFINET I/O, 256 IO devices connectable
  • PROFINET CBA