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Logic gates · Elevator safety · Fire recall

Elevator fire service recall logic

This elevator fire service recall logic diagram shows a simplified boolean model for returning a car to a selected recall landing. An active fire alarm chooses the main landing unless the alternate recall input is active. Motion outputs require the door to be closed and turn off when the matching position is reached. The final output holds the doors at the selected recall landing.

Tipo Diagrama de portas lógicasNorma IEEE Std 91/91a-1991Mecanismo schematex-logicAtualizado 22/09/2026
Elevator Control
Fire service recall logic
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A solicitação

“Draw gate-level logic for elevator fire service recall using FIRE_ALARM, alternate recall selection, main and alternate recall positions, and DOOR_CLOSED inputs to produce RECALL_MAIN, RECALL_ALT, and HOLD_DOORS outputs.”

Depois, tenteAdd a firefighter phase-two input.Add a recall-fault indicator.
O que há neste desenho

Entenda as decisões por trás dele.

01

Alternate selection inhibits the main recall request.

02

Motion is only enabled while the door is closed.

03

The selected recall output stays off once that landing is reached.

04

Door hold asserts when the car is at the selected recall landing.

This diagram illustrates boolean relationships only. Fire service operation must be designed and approved to the applicable elevator and fire alarm standards by qualified professionals.

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Perguntas frequentes

Dúvidas comuns

What is alternate recall?

It is an alternate landing selected when the primary recall floor is unsuitable.

Why require a closed door for recall motion?

The example models a basic interlock so movement is not commanded with an open door.

Can this circuit be used in a real lift?

No. Real fire service controls require certified, code-compliant equipment and design.