상황
A smart irrigation system uses a rain sensor to prevent watering when it rains. Two zone valves are controlled manually via push buttons with a seal-in circuit, but only if the system is enabled and the rain sensor is dry.
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01
Rain sensor input is normally closed (XIO)
02
System enable switch allows overall control
03
Seal-in circuit for each zone valve using parallel branch to maintain after start button release
When designing irrigation control logic for home automation systems with safety interlocks.