Invert gate followed by a low-level signal
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There is such an interlock; process description: If the pressure of the process medium is low, start the pump. The logic diagram is as follows: on the input side, the process medium pressure is low (low level), and an inverter is connected after it ； Output side: Pump start (high level). If the process medium pressure is low, indicating a high level, is it then unnecessary to use an inverter? It doesn’t feel in line with *habit.
With this logic, different people will adopt different approaches. As long as the goal is achieved in the end, there’s no need to worry about it.