Analog input signal flickering

Hello,

I am trying to control the tank scene with PLCSim and TIA Portal . I am trying to read the analog signal from the level meter in TIA Portal, and and it is unstable, it is flickering from 0 to the value read from the level meter at the scene, so I can’t control the valves, cos I am using this signal, as the value that controls the opening and closing of the valves for filling and emptying the tank.
Can you help me?