The IM 151-8 PN/DP CPU features the following:

• Microprocessor; execution time 60 ns per binary instruction
• 192 KB RAM
• Bit-modular expandability for maximum flexibility; up to 63 I/O modules (power, electronic, technology and motor starter modules) in any combination
• PROFINET interface with 3 integrated switch ports (RJ45)
• A password concept protects the user program from unauthorized access
• Block encryption: By means of S7 Block Privacy, the functions (FCs) and function blocks (FBs) can be stored in the CPU in encrypted form to protect the know-how of the application.
• Diagnostics buffer for the last 500 errors and interrupt events (the last 100 entries are retentive)
• SIMATIC MMC
  • Program backup (load memory)
  • Firmware update using MMC
  • External load memory on MMC
• For maintenance-free data backup without battery
• Update via MMC or online update via networks
• Hardware clock; date and time can be appended to diagnostic messages of the CPU
• Integrated communication functions:
  • PG/OP communication
  • PROFINET IO
  • Open IE communication (TCP, ISO-on-TCP and UDP)
  • Web server
  • PROFINET CBA
  • S7 communication (with loadable FBs)
  • Routing
  • Data set routing
• Alarm response time (OB40) less than 10 ms