Siemens SINUMERIK 840DE sl Commissioning Manual page 964

Functionality
5.4 Alarms
An alarm is composed of various nested or parallel state machines. Monitoring can generally
be enabled or disabled. If monitoring is enabled, the alarm can be active or otherwise inactive.
Acknowledgment, confirm and comments of alarms is currently not supported.
The basic type for all condition objects is the condition type. It is derived from BaseEventType.
All mechanisms for alarm processing work even without the condition objects are contained
in the address space.
If a condition object changes one or several states, the server sends an event with the
requested event fields to the client. So only the alarms, where a status change happens after
the connection is established, will be sent. To receive all currently active alarms the refresh
method can be used.
User access right is required to subscribe the Events of the Server Object. User access right
with access permission has to be set to "SinuReadAll" or "AlarmRead".
CncAlarmType
The CncAlarmType, which is specified in the Companion Specification "OPC UA Information
Model for CNC Systems" is derived from the DiscreteAlarmType, which is defined by the OPC
Foundation.
Figure 5-6
Description of the CncAlarmType
Since the CncAlarmType is derived from a number of types as you can see in Figure 5-6, it
does not only contain the three attributes AlarmIdentifier, AuxParameters and HelpSource, but
also all the other attributes which are inherited from the objects, this type is derived of.
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OPC UA Information Model for CNC Systems
SINUMERIK Integrate for Engineering Access MyMachine / OPC UA
Configuration Manual, 12/2017, 6FC5397-1DP40-6BA1