前ステップの値を使用した計算を実施する方法

model countup
  Real counter(start=0);
  Boolean flag;
  Real timeDiff;
  Real checkTime=0.1;
  Real eps=0.001;
equation
  timeDiff = time - checkTime*floor(time/checkTime);
  flag = timeDiff < eps;
  when flag then
    counter = pre(counter) + 1;
  end when;
end countup;

model countup
  Real counter(start=0);
  Real checkTime=0.1;
equation
    when sample(checkTime, checkTime) then
      counter = pre(counter) + 1;
    end when;
end countup;