BlockWerk Documentation
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Ramp

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The Ramp block generates a linearly increasing signal that starts at a specified time and increases at a constant rate (slope). This block is commonly used to create reference signals, test system tracking performance, or simulate gradual changes in control inputs.

The Ramp block has no input ports and produces a single output signal that remains constant at the initial value until the start time, then increases linearly according to the specified slope.

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Mathematical Model

The Ramp block implements:

y(t)={yinitial,t<tstartyinitial+slope⋅(t−tstart),t≥tstarty(t) = \begin{cases} y_{\text{initial}}, & t < t_{\text{start}} \\ y_{\text{initial}} + \text{slope} \cdot (t - t_{\text{start}}), & t \ge t_{\text{start}} \end{cases}

Where:

  • t is the current simulation time
  • initialValue is the output value before the start time
  • startTime is the time at which the ramp begins
  • slope is the rate of change per second

Inputs & Outputs

Direction ID Label Type Status
→ In trigger Trigger number Optional
← Out out Output number Output

Parameters

Parameters Label Type Default Description
slope Slope number 1
startTime Start Time number 0
initialValue Initial Value number 0
finalValue Final Value number 10 Maximum output value when Enable Final Value is true
enableFinalValue Enable Final Value boolean false When enabled, the ramp will stop at the Final Value

Usage Examples

Unit Ramp

Generate a 1:1 increasing signal starting at t=0:

Ramp (slope: 1, startTime: 0) → Integrator → Scope

Slow Pressure Increase

Simulate a system where pressure increases by 0.5 bar every second starting after 2 seconds:

Ramp (slope: 0.5, startTime: 2, initialValue: 0) → BoilerSystem

Remarks & Best Practices

  • Continuous Change: Unlike the Step block, Ramp provides a continuous (but non-smooth) transition.
  • WASM Performance: High-performance implementation ensure accurate tracking in real-time.
  • Indefinite Increase: Note that the output continues to increase forever unless stopped or saturated by a downstream block.

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