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Check non normative text on pure discrete-time FMUs #704

chrbertsch opened this issue Jan 12, 2020 · 1 comment

Check non normative text on pure discrete-time FMUs #704

chrbertsch opened this issue Jan 12, 2020 · 1 comment


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@chrbertsch chrbertsch commented Jan 12, 2020

In FMI 2.0.1 we have the following non-normative text in remark 4 or section 3.1:

This is an optional optimization for the master, the FMU must support all functions that are required for a continuous time FMU and should run in a master that treats it as such. If a pure discrete time FMU has state events and uses event indicators, it has to enter continuousTimeMode to evaluate these. In fact, it is no longer a Pure Discrete time FMU but this was not clearly defined in 2.0 so this clarification is needed for 2.0.1]

Check that in FMI 3.0 we have a correction in the normative text and adapt or remove the normative text

@chrbertsch chrbertsch added this to the v3.0 milestone Feb 11, 2020
@t-sommer t-sommer added the task label Feb 21, 2020
@chrbertsch chrbertsch changed the title Check non normative text on pure discrete FMUs Check non normative text on pure discrete-time FMUs Feb 21, 2020

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@chrbertsch chrbertsch commented Feb 21, 2020

(The original issue was #409)

I consider it problematic that "pure discrete time FMU" seem to be only defined in non-normative remarks:

  • remark 2 of 3.1.2, which deals with "discrete-time FMUs" without the "pure". Is this the same?
  • remark 4. of 3.1.2 grafik

but then we refer to this definition in normative text (footnote of the table at the end of 3.2.3

I see the following alternatives for FMI 3.0:

  • Correct the definition in the remark 4 to "If an FMU has only discrete-time equations (and no variables with variability = continuous and no state events and event indicators), ..." But still this then should be move to a normative text part
  • get completely rid of the definition of "pure discrete-time FMUs", as in FMI 3.0 there are new ways to express discrete-time systems like clocks and the new FMU type SES

I would favour the second option. Or do I miss something? Or other suggestions?

@chrbertsch chrbertsch added Berlin2020 and removed task labels Feb 23, 2020
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