The CPU 1518-4 PN/DP features:

• A powerful processor:
  The CPU achieves command execution times as low as 1 ns per binary instruction.
• Large work memory:
  4 MB for program, 20 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)
• Display with functions for:
  • Display of overview information such as IP address of the integrated interface, station name, higher level designation, location designation, etc.,
  • Display and acknowledgment of diagnostic and user messages
  • Display of module information
  • Showing display settings
  • Display of a user-definable logo
  • Setting of IP addresses
  • Setting of date and time
  • Selection of the operating mode
  • Resetting of the CPU to factory settings
  • Backup and restoring of the project
  • Disabling/enabling of the display
  • Enabling of protection levels
• PROFINET IO IRT interface and second PROFINET IO RT interface for connecting distributed I/O via PROFINET
• Three PROFINET interfaces for network separation, for example; PROFINET interface X3 with a data transfer rate of up to 1 Gbit/s
• PROFIBUS DP interface for connecting distributed I/O via PROFIBUS