The CPU 1517-3 PN/DP features:

• A powerful processor:
  The CPU achieves command execution times as low as 2 ns per binary instruction.
• A large work memory:
  2 MB for program, 8 MB for data
• SIMATIC Memory Cards as load memory;
  permit additional functions such as datalog and archives
• Flexible expansion capability:
  single-tier configuration with max. 32 modules (CPU + 31 modules)
• Screen with functions for
  • Displaying overview information such as IP address of the integrated interface, station name, plant designation, location identifier, etc.
  • Display and acknowledgment of diagnostic and user messages
  • Displaying module information
  • Showing display settings
  • Displaying a user-definable logo
  • Setting IP addresses
  • Setting date and time
  • Selecting the operating mode
  • Resetting the CPU to factory settings
  • Backup and restoring of the project
  • Disabling/enabling of display
  • Enabling of protection levels.
• PROFINET IO IRT interface and second PROFINET IO RT interface for connecting distributed I/O via PROFINET
• PROFINET interface for network separation
• PROFIBUS DP interface for connecting distributed I/O via PROFIBUS