[hubertus65]

The Integer and Boolean versions of Modelica.Clocked.*Signals.Sampler.Utilities.AssignClockToSquareWaveHold relate the clock of their input u to the internal square wave y2 through a "dummy condition" with identical branches:

// dummy condition to relate clock of u with y2
y2 = if u > 0 then not previous(y2) else not previous(y2);

A tool may legitimately simplify this to y2 = not previous(y2), which removes the only relation between u and y2. OpenModelica 1.27.1 does exactly that and assigns the default clock (1 s) to y2. With a 20 ms input clock, the output then toggles once per second instead of at every tick.

The Real version of the block does not have this problem. It ties the two signals with a clocked when-equation and a dummy assignment. This PR uses the same pattern in the Integer and Boolean versions:

  Integer uu;   // Boolean uu; in the Boolean version
equation
  when Clock() then
     uu = u "Dummy assignment to relate clock of u with y2";
     y2 = not previous(y2);
  end when;

Verification (OpenModelica 1.27.1)

Test: an Integer and a Boolean signal sampled with a 20 ms periodic clock, each converted with AssignClockToSquareWaveHold, simulated for 1 s.

	Toggles of y in 1 s, before	after
IntegerSignals version	2 (default 1 s clock)	51 (every 20 ms)
BooleanSignals version	2 (default 1 s clock)	51 (every 20 ms)

Modelica.Clocked.Examples.Elementary.RealSignals.AssignClockToSquareWaveHold is bit-identical before and after. Dymola 2026x translates the changed blocks; the local license limit prevented simulation. The test model is part of the ModelicaTest coverage work on branch coverage-improvement.

🤖 Generated with Claude Code

https://claude.ai/code/session_01UmNZkRw6HV9CeBvNk36AzT