As a precondition, the IE Databus has to be installed on the IED and its data connection configured accordingly via the IEM. For detailed information, refer to the IE Databus documentation.
To acquire data from the IE Databus, as a first step you need to configure the SINUMERIK Connector to provide the data to the IE Databus. This can be done by using the Common Configurator. To do this, select an acquisition cycle for each data point that shall be provided on the IE Databus and activate “Publish on the databus”.
As a second step, the client app must subscribe to the corresponding data bus topic. To do this, the "app_instance_id" of an IE Connector, the name of the data source (connection) and the name of the corresponding topic must be used.
For the SINUMERIK Connector, the "app_instance_id” (aka "Connector ID") is "cssinumerikconnector". The corresponding topic for the example configuration above would be:
"ie/d/j/simatic/v1/cssinumerikconnector/dp/r/MySinumerikNCU1/100ms"
Ensure that for the IE Databus the necessary users, privileges and credentials are defined properly.
For more information how to access to IE Databus topics, refer to the IE Databus and the Common Configurator documentation.
Best practice: Use the IE Flow Creator and a "MQTT in" node to subscribe to topic "ie/#" to get an overview of all available IE Databus topics. Do not forget to provide proper IE Databus credentials for the MQTT server used by the "MQTT in” node.