User Manual

Automation stations
Error sources and monitoring functions
18
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The device object has an alarm mechanism, because system alarms and
system events, which cannot be assigned to a data point, may occur in an
automation station. The alarm state machine and alarm-relevant connections
are mapped to the BACnet properties of the device object.
18.3 Error sources and monitoring functions
There are various error sources, e.g.:
Error Effect
Memory error, e.g., faulty flash memory Desigo PX stops working.
Battery failure Desigo PX continues working.
Failure of backup server recognized by primary server Desigo PX recognizes the fault and transmits the relevant alarm.
Non-critical hardware and software errors are identified by Desigo PX and
registered as a device object alarm.
When a critical hardware or software error occurs, the automation station tries
to restart. If the same error is detected three times within 15 minutes, the
automation station switches to the COMA operating state. If the Fault LED is
lit, the automation station is in the COMA operating state.
The values in the Online Properties window in Xworks Plus (XWP) give clues
about the operation of the automation station.
Properties for system
alarms and system
events
Non-critical errors /
configuration errors
Critical errors
Online properties for
diagnostics