PubSub defines different configuration parameters for the various PubSub components. They define the behaviour of Publisher and Subscriber. The parameters are grouped by component and are partitioned into ‘common’, ’message mapping’, and ‘transport protocol mapping’.

The common parameters are defined in 6.2. The parameters for the different message mappings are defined in 6.3. The parameters for the different transport protocol mappings are defined in 6.4.

The application of communication parameters for concrete message and transport protocol mappings is defined in clause 7.

Configuration of these parameters can be performed through the OPC UA Information Model for PubSub configuration defined in clause 9 or through vendor-specific mechanisms. The parameter groupings in this clause define the parameters and also define Structures used to represent the parameters of the groupings. These Structures are used in the PubSub configuration model described in clause 9 but they can also be used for offline configuration or vendor-specific configuration mechanisms.

Figure 17 depicts the different components and their relation to each other. The WriterGroup, DataSetWriter and PublishedDataSet components define the data acquisition for the DataSets, the message generation and the sending on the Publisher side. These parameters need to be known on the Subscriber side to configure DataSetReaders and to filter and process DataSetMessages.


Figure 17 – PubSub Component Overview

The figure shows the following components:

The different PubSub mapping specific parameter groupings are shown in Figure 18.


Figure 18 – PubSub Mapping Specific Parameters Overview

Transport protocol mapping specific parameters may be defined for the PubSubConnection, the WriterGroup or the DataSetWriter.

Message mapping specific parameters are defined for the NetworkMessages on the WriterGroup and for the DataSetMessages on the DataSetWriter.