Step

Step signal.

Collaboration diagram for Step:

This is a combined step and pulse signal SimObject. It has no input port, and has one output port with a scalar or vector signal.

An example of a step function.

Author

Karl-Johan Reite

Date

16.02.2011 KJR: Initial version.

Example configuration excerpt

<Lib
  LibName    = "fhsim_base"
  SimObject  = "Src/Step"
  Name       = "step"
  PortWidth  = "1"
  StartValue = "0"
  StartTime  = "1"
  StopValue  = "1"
  StopTime   = "2"
/>

Input Ports

This function has no inputs.

Output Ports

Name	Width	Description
Out	<PortWidth>	The step output signal
OutDot	<PortWidth>	The derivative of the step output signal

Configuration parameters

Name	Width	Description
PortWidth		The number of elements in the signal.
StartValue	<PortWidth>	The start value of the output port. This may either be a scalar, or a comma separated list refering to the different elements of the signal.
StopValue	<PortWidth>	The stop value of the output port. This may either be a scalar, or a comma separated list refering to the different elements of the signal.
StartTime	<PortWidth>	The time to start the step. This may either be a scalar, or a comma separated list referrint to the different elements of the signal.
StopTime	<PortWidth>	The time to stop the step. This may either be a scalar, or a comma separated list referrint to the different elements of the signal. If this is negative, this is a true step function with unlimited duration. If it is larger than zero, it is a pulse function, which goes back to the StartValue after the StopTime.

Initial conditions

There are no initial conditions for this function.

Full example file

<Contents>
  <OBJECTS>
    <Lib
        LibName="base"
        SimObject="Src/Step"
        Name="A"
        StopValue="10"
        StopTime="-1"
        StartTime="5"
        StartValue ="0"
    />
  </OBJECTS>
 
  <INTERCONNECTIONS>
    <Connection
    />
  </INTERCONNECTIONS>
 
  <INITIALIZATION>
    <InitialCondition
    />
  </INITIALIZATION>
 
  <INTEGRATION>
    <Engine
    IntegratorMethod="2"
    NumCores="1"
    TOutput="0, 0:0.5:10, 1000"
    LogStates ="1"
    stepsize ="0"
    HMax="0.002"
    HMin="0.00000001"
    AbsTol="1e-3" RelTol="1e-3"
    UseRSSNormInsteadOfInfNorm="0"
    FileOutput="objects:all"
    />
  </INTEGRATION>
</Contents>

This SimObject is referred to as Src/Step