Supported functions
The following table lists the supported standard AlarmTypes of the Alarms & Conditions function of the TwinCAT OPC UA Server.
AlarmType | Description |
|---|---|
LimitAlarmType | Allows you to define different threshold values for a symbol. If a threshold value is exceeded, the alarm is triggered with a configurable alarm text and severity level. |
OffNormalAlarmType | Enables the definition of “normal” and “non-normal” threshold values for a symbol. If the value of the symbol deviates from the defined value, the alarm is triggered. |
 | BOOL usage with OffNormalAlarmType If a BOOL is to be used for the OffNormalAlarm type, the notation true and false must be used. If capitalized, the TwinCAT OPC UA Server assumes a STRING and no longer interprets the value as a BOOL. |
In addition to the Alarms & Conditions function, the TwinCAT OPC UA Server also offers the option to connect to the TwinCAT EventLogger and forwarding the alarms or events received there accordingly as an OPC UA Alarm or Event.