OPC UA Subscription

The OPC UA Subscription Channel is an Inbound Channel, which is used to monitor data changes on an OPC UA Server (Environment Entry). For this purpose, each OPC UA Subscription (dynamic) Channel creates its own Subscription, which holds a list of monitored items. If one or more of these monitored items change their value, the OPC UA Subscription (dynamic) Channel will be triggered from the OPC UA Server and starting a Process Model.

The monitored items are Nodes from the Server Address Space of an OPC UA Server. The nodes that are monitored can be added dynamically to the list of monitored items. Therefore, the user has to create a process model that uses the script-API of the channel to modify the set of configured items.

Currently, this channel can be used for Object Nodes and VariableShape Nodes only.

Start error process: If the channel encounters an error you can connect it in the process model with an error start event to create a process instance for handling that error.

If you leave the error hold time field as blank as the process instance will be created every time an error occurs. If errors occur rapidly, a lot of process instances will be created. You can avoid this by entering a period of time in the field. Any further errors occur within this period, no further error process instance will be created.