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unfixed startvalues in Modelica.Electrical.Analog.Examples.AD_DA_conversion #1563

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modelica-trac-importer opened this issue Jan 15, 2017 · 3 comments
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unfixed startvalues in Modelica.Electrical.Analog.Examples.AD_DA_conversion #1563

modelica-trac-importer opened this issue Jan 15, 2017 · 3 comments
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bug Critical/severe issue L: Electrical.Analog Issue addresses Modelica.Electrical.Analog P: high High priority issue
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MSL3.2.1+build.3

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Reported by jfrenkel on 2 Sep 2014 06:20 UTC
In the example Modelica.Electrical.Analog.Examples.AD_DA_conversion are the following unfixed Variables in the initial System:

  • pulse.T0
  • dA_Converter.vout

The following Variables could also be set fixed=true but they does not infulence the initial system and could be ignored because of that:

  • aD_Converter.z
  • dA_Converter.y

OpenModelica reports:

Warning: Assuming fixed start value for the following 4 variables:
         dA_Converter.vout:DISCRETE(fixed = false ) .Modelica.Electrical.Analog.Examples.AD_DA_conversion, .Modelica.Electrical.Analog.Ideal.DA_Converter, .Modelica.SIunits.Voltage type: Real 
         pulse.T0:DISCRETE(start = pulse.startTime fixed = false )  "Start time of current period".Modelica.Electrical.Analog.Examples.AD_DA_conversion, .Modelica.Electrical.Digital.Sources.Pulse, .Modelica.SIunits.Time type: Real 
         aD_Converter.z:DISCRETE(fixed = false ) .Modelica.Electrical.Analog.Examples.AD_DA_conversion, .Modelica.Electrical.Analog.Ideal.AD_Converter, .Integer type: Integer 
         dA_Converter.y:DISCRETE(start = 0.0 fixed = false ) .Modelica.Electrical.Analog.Examples.AD_DA_conversion, .Modelica.Electrical.Analog.Ideal.DA_Converter, .Real type: Real

and also SimX report it. Dymola does not report it.

Migrated-From: https://trac.modelica.org/Modelica/ticket/1563
@modelica-trac-importer modelica-trac-importer added bug Critical/severe issue L: Electrical.Analog Issue addresses Modelica.Electrical.Analog P: high High priority issue labels Jan 15, 2017
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Modified by beutlich on 8 Sep 2014 11:27 UTC

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Comment by otter on 6 Jan 2015 16:37 UTC
Fixed in 3fc5a9b (maintenance) and in 1c23a93 (trunk):

In fact fixed=true definitions are missing. Therefore, the following changes have been performed:

  • Modelica.Electrical.Digital.Sources.Pulse: Introduced fixed=true for T0
  • Modelica.Electrical.Analog.Ideal.DA_Converter: Introduced for y "fixed = true" and for vout "start=0, fixed = true"
  • Modelica.Electrical.Analog.Ideal.AD_Converter: Introduced for z "start=0, fixed=true"

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Changelog modified by otter on 6 Jan 2015 16:37 UTC
Digital.Sources.Pulse, DA_Converter, AD_Converter: Adding missing fixed=true values for discrete-time variables

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bug Critical/severe issue L: Electrical.Analog Issue addresses Modelica.Electrical.Analog P: high High priority issue
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