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Execution check by “watchdog” is carried out with respect to three priority levels.
Task reference, supervision time and consequences at exceeded time are given below:
• Timer task - 100 ms - safety shut-down
• Application program - 5 s - safety shut-down
• Idle task - 30 minutes - system message about a system too heavily loaded.
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All I/O modules are checked regarding missing hardware or errors in the addressing logic.
It is common to all I/O modules that, if any error is detected, an alarm and a message go to the
operator. The error is also indicated with a red LED on the front of the board. The application
program handles necessary actions via the data base. Different types of I/O modules have
adapted diagnostics and error handling. For further information on this topic, see Chapter 5,
Maintenance.
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• Supervision of the internal 24 V supply and the stabilized 5 V supply
• Applicable supervision of power supply for sensors
• Supervision of the battery backup supply.
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Adequate diagnostics and error handling are also available/possible for the following equipment
and functions:
• Communication links
• Terminal/printer connection
•Fans
• Redundant functions in general.
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The System Status Collector TC520 in the controller subrack performs certain system
supervision. Diagnostic signals from power supply units and fans within the cabinets are
connected to TC520.
The front connector of TC520 provides the connection for four extra user-defined supervisory
signals (24 V). Two of them are intended to be used for redundant I/O voltage supply
supervision. The signal cables may not be extended outside the controller cabinets due to the
risk of interference.
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