WOLFRAM SYSTEM MODELER

TriggeredRead

A block for reading data from items on an OPC server at intervals determined by an external Boolean signal (trigger)

Wolfram Language

In[1]:=

SystemModel["OPCUA.Blocks.SamplerReal.TriggeredRead"]

Out[1]:=

Information

This block reads data of type Real from the OPC UA server it is connected to. Unlike the read blocks that have a parameter for setting the sample period, the triggered read blocks read data when Boolean input signal trigger has a rising edge. The block inherits the properties of the partial model TriggeredSampler. Only scalar nodes can be read; i.e. no array or matrix nodes are supported.

At every sampling instant, external function readExternalReal is called from within the block.

Relevant Parameters

nodeID: which OPC UA node to read data from (ID value should always be inside quotes)
nodeNamespace: which namespace the node is located in
nodeIDType: which ID type to use, numeric or string

Interfaces

y: a Real output, which is the sampled signal
serverID: the connector that connects the block to the OPC server component
trigger: a Boolean input that determines when the block should sample data

Parameters (4)

nodeIDType	Value: Type: UANodeIdType Description: The node identifier type
nodeID	Value: Type: String Description: The node identifier
nodeNamespace	Value: Type: Integer Description: The node namespace
y_start	Value: Type: Real Description: Initial value of output signal

Connectors (3)

	trigger	Type: BooleanInput Description: Boolean input that determines when sampling should occur
	serverID	Type: BlockConnector Description: The unique ID of the server the block is connected to
	y	Type: RealOutput Description: The data read from the item on the OPC server