상황
Design a ladder logic program for a residential garage door opener that allows manual open/close via pushbuttons, holds the motor until limit switches are reached, and prevents closing while the safety beam is interrupted.
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01
Use seal-in contacts to maintain motor run after pushbutton release
02
Incorporate XIO interlocking to prevent simultaneous open and close commands
03
Use XIC for normally closed limit switches to stop motor at travel ends
04
Include XIC for safety beam to inhibit closing when beam is broken
Applicable to any scenario requiring bidirectional motor control with limit switches, safety interlocks, and seal-in logic, such as gate openers, conveyor reversers, or linear actuator positioning.