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Logic gates · Elevator control · Combinational logic

Two-floor elevator call and direction logic

This two-floor elevator control logic diagram keeps the core dispatch rule small enough to read at a glance. A call for floor 2 commands upward travel only when the car is at floor 1 and the door is closed. The reverse condition commands downward travel. Two small AND gates detect a call for the current floor, and an OR gate turns those conditions into a door-open output.

Type Schéma de portes logiquesNorme IEEE Std 91/91a-1991Moteur schematex-logicMis à jour 22/09/2026
Elevator Control
Two-floor elevator direction logic
Drawing preview
La demande

“Draw compact gate-level logic for a two-floor elevator with CALL_1, CALL_2, AT_F1, AT_F2, and DOOR_CLOSED inputs. Output MOVE_UP for a floor-2 call from floor 1, MOVE_DOWN for a floor-1 call from floor 2, and DOOR_OPEN for a call at the current floor.”

Essayez ensuiteAdd an overload inhibit.Add a door-locked input.
Ce que contient ce dessin

Comprenez les décisions qui le sous-tendent.

01

MOVE_UP requires a floor-2 call, the car at floor 1, and a closed door.

02

MOVE_DOWN mirrors that logic for a floor-1 call from floor 2.

03

Each door-open term requires a matching call and at-floor signal.

04

A final OR gate combines the two door-open conditions.

This compact combinational example is suitable for introductory control logic. Real elevators also need interlocks, position sensing, timing, fault handling, and safety-certified equipment.

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FAQ

Questions fréquentes

Why is DOOR_CLOSED required for movement?

It models a basic permission condition so the circuit does not command travel with an open door.

What happens when the car is already at the called floor?

The matching door-open term asserts instead of either travel output.

Does this circuit remember a call?

No. It is combinational logic; request memory would require latches or flip-flops.