• Password protection;
  a password concept protects the user program from unauthorized access.
• Diagnostics buffer;
  the last 500 errors and interrupt events are saved in a buffer for diagnostics purposes.
• Maintenance-free data back-up;
  all standard data is automatically written onto the SIMATIC Micro Memory Card by the CPU if there is a voltage interruption, and is available 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:

• MPI multipoint interface;
  determining station addresses
• Restart/cycle time behavior;
  stipulation of maximum cycle time and loading as well as self-test functions
• Clock bit memory;
  setting of addresses
• Protection level;
  specifying the access rights to program and data
• System diagnostics;
  determining handling and scope of the diagnostic alarms
• Watchdog interrupts;
  setting of periodicity
• Clock interrupts;
  setting of start date, start time and periodicity
• PROFIBUS DP master/slave interface;
  user-defined address assignment for distributed I/O

Information and display functions

• Status and error indications;
  LEDs indicate hardware, programming, time or I/O 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;
  you can use the PG to obtain information about the storage capacity and operating mode of the CPU as well as the current loading of the main and load memories as well as current cycle times and diagnostic buffer contents in plain text.