WOLFRAM SYSTEM MODELER
TriggeredReadA block for reading data from items on an OPC server at intervals determined by an external Boolean signal (trigger) |
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Wolfram Language
In[1]:=
SystemModel["OPCUA.Blocks.SamplerReal.TriggeredRead"]
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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)
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trigger |
Type: BooleanInput Description: Boolean input that determines when sampling should occur |
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serverID |
Type: BlockConnector Description: The unique ID of the server the block is connected to |
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y |
Type: RealOutput Description: The data read from the item on the OPC server |
Used in Examples (2)
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OPCUA.Examples Basic example that demonstrates how to write to and read from nodes on an OPC UA server using a signal trigger |
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OPCUA.Examples Model that samples data from an OPC UA node irregularly |