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s7 300 Using compare func, for analog input to control 3 valves in series

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I am facing problem to apply compare function with load cell analog input to control 3 valves: whereas

I have one load cell under three bins for three different materials:

when start button is pressed, v1 opens and the system measure the weight

if the weight equal or more than 500, v1 closes and v2 opens to measure material 2

if the total weight more than 1000, v2 closes and v3 opens to measure material3

if the total weights more than 1500 , v3 closes and v4 opens to discharge these materials into mixer.


I need help how to apply this in ladder diagram


thanks in advance


3 mixed materials.docx

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