select command
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As the title suggests, it’s about the liquid levels in two tanks; each tank has a level indicator. These two level indicators are connected together and both fed to the select terminal. What does that mean? Please give your advice
The meaning of “select” is that any one of them can be used for control
If there are no greater-than or less-than signs, it should be the operator who makes the choice
It’s that the levels of the two liquids can potentially be controlled. If automatic selection is used, there should be rules governing this; if it’s not automatic, then the operator must choose the control method