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There are six primary components used in a system using IoT Bridge. There are:
There are some translations that need to take place between the components and these platforms have different capabilities that result in some limitations in how an Edge Gateway can be configured. For example, UDTs in Ignition support more data types that Azure Digital Twin (ADT) does. As a result, use of data types in Ignition must be limited to those supported by Azure Digital Twin (ADT) in order for data to properly show up and be updated in Azure Data Explorer.
Ignition and Azure Digital Twins use different terminology for similar constructs. Those definitions are below.
Ignition ‘UDT parameters’ are mapped to specific digital twin property called ‘templateParameters’.
Transform, Metric, and Hierarchy definitions in Azure Digital Twins are not used by IBAZ.
Azure Digital Twin only supports Boolean, Date, DateTime, Double, Duration, Float, Integer, Long, String, and Time. As a result, this is the list of data types in Ignition that are supported for consumption into Azure Digital Twin.
Boolean
DateTime
Double
Float
Integer
Long
Byte (will be up-casted to an Integer)
Short (will be up-casted to an Integer)
Integer
Float (will be up-casted to a Double)
Double
String
Any non-supported data type will be converted to a String in ADT and the measurement value for any instance will show an error with a message similar to "Long is not a valid datatype"
These are not supported currently in IoT Bridge. Azure Digital Twin allows Asset Models to have one or more child Asset Models. Ignition supports UDTs having children UDTs as well as UDTs referencing a parent UDT. However, these hierarchical relationships will not be maintained by IBAZ. Support for simple hierarchies as supported by Azure Digital Twin will be added in a future version of IoT Bridge.
Azure Digital Twin has limits and quotas on many different aspects of asset model counts, asset counts, number or attributes per model, etc. For details on those limits see this document.
There are three types of digital twins created by IBAZ to show the connection metrics.
IBAZ_Metrics_IBAZ_Info
IBAZ_Metrics_MQTT_Client