Triggered sampler

Samples the input at each rising edge of trigger and holds it.

  • signal
  • Boolean
  • Modelica Standard Library
  • 3 ports
  • 1 parameter
BlockTriggered samplerKindtriggeredSamplerLibraryLogic

Description

Samples a Real input at each rising edge of a Boolean trigger and holds that value until the next rising edge.

Example

Latch, timer, and sampler Start and stop buttons set and reset a flip-flop, which times the run, gates a signal, and samples the start time.

EnableStartStopEnabled startStart edgeStop edgeRunningRun timeSine 1 Hz0Gated sineClockStart time
In Gradara, select a Triggered sampler block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:ConstantSine waveClockANDSwitch (logic)RS flip-flopTimerBoolean constantBoolean stepRising edge

Ports

Inputs 2

  • triggerBoolean

    Boolean trigger. The input is sampled each time it changes from false to true.

  • usignal

    Real input to sample.

Outputs 1

  • ysignal

    Last sampled value; y_start until the first rising edge.

Parameters

  • Initial outputy_start0

    Output before the first rising edge of the trigger. Any real number.

Equations

Modelica
At each rising edge of trigger: y = u
y = y_start at the start.

Implementation

Modelica Standard Library 4.1.0Modelica.Blocks.Discrete.TriggeredSampler
MSL documentation

Assumptions and limitations

  • A trigger that is already true at the start does not sample; the first sample is at its next rising edge.

Tips

  • For sampling at a fixed rate, use Zero-order hold.

See also

Select a block in Gradara and press F1 to open its page offline.