V1 ③文 5 L2 V2 M M2 V1 - filling valve (on/off); V2 - emptying valve (on/off); L1 - top level sensor (on/off); L2 - botto

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V1 ③文 5 L2 V2 M M2 V1 - filling valve (on/off); V2 - emptying valve (on/off); L1 - top level sensor (on/off); L2 - bottom level sensor (on/off); M1 button to fill the tank; M2 button to empty the tank; Evaluation -Variable declaration (1b) -Connection diagram and description (2b) -Control program and description (5b) -Convert three Rungs into ST (2b) DI DI DI DI DO V1 DO V2 Algorithm: -If M1 is switched ON, tank filling begins -> V1 is opened and is kept open until L1 switches ON; -If M2 is switched ON, tank should be emptied -> V2 is switched ON and is kept ON until L2 switches OFF; In all other cases: -if L2 is OFF, V1 should switch ON until L1 switches ON; -if L1 is ON then V2 should be switched ON until L1 switches OFF. 12 Vald.