task MESSEN is
  entry FUELLSTAND(WERT: out WERT_T);
end MESSEN;

task STELLEN is
  entry VENTILE(ZV1, ZV2: ZV_T);
  entry VOLL;
  for VOLL use at 16#200#;
  entry LEER;
  for LEER use at16#300#;
end STELLEN;