• Password protection;
  a password concept protects the user program from unauthorized access.
• Block encryption;
  the functions (FCs) and function blocks (FBs) can be stored in the CPU in encrypted form by means of S7-Block Privacy to protect the know-how of the application.
• Diagnostics buffer;
  the last 500 error and interrupt events are stored in a buffer for diagnostic purposes, of which 100 are stored retentively.
• Maintenance-free data backup;
  the CPU automatically saves all data (up to 256 KB) in case of power failure so that the data are available again unchanged following voltage recovery.

Parameterizable properties

The S7 configuration as well as the properties and response of the CPUs can be parameterized using STEP 7:

• General;
  definition of the name, higher level designation and location ID
• Startup;
  definition of the startup characteristics of the CPU and the monitoring time
• Synchronous cycle interrupts;
  setting of DP master system, process image partition number, and delay time
• Cycle/clock memory;
  specifying the maximum cycle time and loading, setting the clock memory address. Enabling prioritized HMI communication
• Retentivity;
  setting retentive areas
• Time-of-day interrupts;
  setting of start date, start time and periodicity
• Cyclic interrupts;
  setting of periodicity
• System diagnostics;
  determining handling and scope of the diagnostic messages
• Clock;
  setting the type of synchronization in the AS or on the MPI
• Protection level;
  specifying the access rights to program and data
• Communication;
  reservation of connection resources
• MPI/PROFIBUS DP interface;
  setting the interface type. Determining node addresses. Parameterizing the operating mode and configuring the transfer areas in the case of PROFIBUS DP. Parameterizing the time synchronization
• PROFIBUS DP master/slave interface;
  user-oriented address allocation for distributed I/O. Parameterizing the operating mode and configuring the transfer areas in the case of PROFIBUS DP. Parameterizing the time synchronization

Display and information functions

• Status and error indications;
  LEDs indicate hardware, programming, time, I/O and bus errors, and operating statuses such as RUN, STOP and start-up.
• Test functions;
  the PG is used to indicate signal status during program execution, to modify process variables independently of the user program and to output the contents of stack memories.
• Information functions;
  the PG can be used to obtain information about the memory capacity and operating mode of the CPU, the current loading of the work and load memory, current cycle times and diagnostics buffer content in plain text.

Integrated communication functions

• PG/OP communication
• Global data communication
• S7 basic communication
• S7 communication (server only)
• Routing
• Data record routing

System functions

The CPU provides many extensive system functions for diagnostics, parameterization, synchronization, alerting, time measurement, etc.

For detailed information, refer to the manual.