Elevator door and motion interlock logic
This elevator door and motion interlock diagram turns a few basic operating conditions into two outputs. RUNENABLE requires a car call, closed and locked doors, no overload, normal inspection status, and a condition away from a floor. DOOROPENENABLE allows an opening command only when the car is at a floor and the same inhibit conditions are clear.
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Scenario
An instructional interlock circuit determines when a car may move and when doors may be opened at a landing.
Key decisions
- Both closed and locked door signals are required for movement.
- Overload and inspection mode inhibit normal operation.
- An at-floor signal prevents a normal run command.
- Door opening requires the car to be at a floor and not overloaded.
When to reuse this
Use this for a digital logic or controls exercise. Actual elevator safety chains use redundant, monitored, safety-rated circuits beyond this conceptual gate diagram.
Frequently asked questions
Why need both door closed and locked?
What does inspection mode do?
Is overload normally a gate input?
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