WOLFRAM SYSTEM MODELER
TriggeredSamplingDemonstrates how to sample data from an OPC UA node irregularly |
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Diagram
Wolfram Language
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SystemModel["OPCUA.Examples.TriggeredSampling"]
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Information
This example demonstrates how to achieve irregular sampling from an OPC UA server using an EventClock .
This example requires an OPC UA example server running on localhost.
Read about how to start the example server here.
An EventClock is used as read clock for a Client to sample data from a OPC UA server at irregular time intervals.
Each time the output from booleanTable becomes true, data is read by the client.
The sampled signal is then passed through a lowpass Butterworth filter and used as a reference signal to control the height of the liquid in the tank.
Parameters (1)
| errorHandling |
Value: Types.ErrorHandling.ErrorWhenUncertain Type: ErrorHandling Description: How to handle node errors (request errors are handled by the connected Read/WriteNodeList component) (write.errorHandling) |
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Components (12)
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client |
Type: Client Description: Client for connecting to an OPC UA server |
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tank |
Type: ControlledTank Description: Model of a simple tank with actuator input |
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PI |
Type: LimPID Description: P, PI, PD, and PID controller with limited output, anti-windup compensation, setpoint weighting and optional feed-forward |
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booleanTable |
Type: BooleanTable Description: Generate a Boolean output signal based on a vector of time instants |
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const |
Type: Constant Description: Generate constant signal of type Real |
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gain |
Type: Gain Description: Output the product of a gain value with the input signal |
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filter |
Type: Filter Description: Continuous low pass, high pass, band pass or band stop IIR-filter of type CriticalDamping, Bessel, Butterworth or ChebyshevI |
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combiTimeTable |
Type: CombiTimeTable Description: Table look-up with respect to time and linear/periodic extrapolation methods (data from matrix/file) |
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write |
Type: Write Description: Adds writing of a Real scalar node to a WriteNodeList |
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read |
Type: Read Description: Adds reading of a Real scalar node to a ReadNodeList |
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writeClock |
Type: PeriodicExactClock Description: Generate a periodic clock signal with a period defined by an Integer number with resolution |
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readClock |
Type: EventClock Description: Generate a clock signal when the Boolean input changes from false to true |