상황
Designing a PLC-based control system for maintaining water level in a tank using float switches to sense high and low levels and a pump to fill the tank.
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01
Using pull-down resistors to ensure reliable PLC input states when switches are open
02
Using a relay output module to drive the pump motor for isolation and power handling
When automating a tank filling process with PLC control, suitable for water treatment, manufacturing, or agricultural water storage.