WOLFRAM SYSTEM MODELER
ReadA block for reading data from items on an OPC server at intervals determined by parameter samplePeriod |
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Wolfram Language
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SystemModel["OPCClassic.Blocks.SamplerReal.Read"]
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Information
This block reads data of type Real from the OPC server it is connected to. It inherits the properties of the partial model Sampler, which contains parameters such as samplePeriod and itemName that determine how often and from which OPC item the data should be read.
At every sampling instant, external function readExternalReal is called from within the block.
Relevant Parameters
- samplePeriod: determines how often to sample data from the OPC item
- startTime: when the block should start to read data
- itemName: which OPC item to read data from
Interfaces
- y: a Real output, which is the sampled signal
- serverID: the connector that connects the block to the OPC server component
Parameters (4)
| samplePeriod |
Value: Type: Time (s) Description: Sample period of component |
|---|---|
| startTime |
Value: 0 Type: Time (s) Description: First sample time instant |
| itemName |
Value: Type: String Description: The OPC item that data should be written to or read from |
| y_start |
Value: 0 Type: Real Description: initial value of output signal |
Outputs (2)
| sampleTrigger |
Type: Boolean Description: True, if sample time instant |
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| firstTrigger |
Type: Boolean Description: Rising edge signals first sample instant |
Connectors (2)
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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 (3)
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OPCClassic.Examples Basic example that demonstrates how to write to and read from items on an OPC server |
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OPCClassic.Examples Example that demonstrates a possible use of multiple servers |
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OPCClassic.Examples A tank system model where height data is written to and read from an OPC item |
Used in Components (1)
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OPCClassic.Blocks.SamplerReal A block for reading data from multiple items on an OPC server at intervals determined by parameter samplePeriod |