• Block protection:
  A password concept protects the user program from unauthorized access.
• Integral HMI services:
  The user only has to specify the source and destination of the data with HMI devices; the data are then transported cyclically and automatically by the system.
• Integrated communications functions:
  • PG/OP communication
  • Shared data communication
  • S7 standard communication
  • S7 Communication

CPU 414-3 PN/DP additional:

• Open communication over TCP/IP, UDP and ISO-on-TCP (RFC1006)
• Distributed intelligence in Component Based Automation (CBA) on PROFINET
• Additional diagnostic options with integrated webserver
• Firmware update using network

Parameterizable attributes

The STEP 7 tool "Hardware Configuration" can be used to program the properties and response of the S7-400 including the CPUs, e.g.

• Multi-point interface MPI:
  • Definition of station addresses.
  • Startup/cycle behavior
  • Stipulation of the maximum cycle time and communications load
• Address assignment:
  Addressing of I/O modules.
• Retentive ranges:
  Definition of the number of retentive bit memories, counters, timers, data blocks and clock memories.
• Size of the process image, local data.
• Length of the diagnostics buffer
• Protection level:
  Definition of access authorization for program and data
• System diagnostics:
  Definition of the handling and scope of diagnostic messages
• Timed interrupts:
  Setting of periodicity

CPU 414-3 PN/DP additional:

• PROFINET Interface
• Parameterization of time synchronization using NTP procedure

Indication and information functions

• Status and error indicators:
  LEDs indicate internal and external errors and operating states such as RUN, STOP, Restart, Test function, for example.
• Test functions:
  The programming device can be used to display signal states in program execution, modify process tags irrespective of the user program, read out the contents of stack memories, run separate program steps and inhibit program components.
• Information functions:
  The programming device can be used to provide the user with information on the memory capacity and operating mode of the CPU and the current utilization of the working and load memories