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LOGIC GATES

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.

UPDATED 2026-09-23
TYPELogic
USE-CASEElevator Control
EXAMPLEElevator fire service recall logic
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CASE ANALYSIS

Scenario

A simplified teaching circuit routes a recalled elevator to a main or alternate landing when a fire alarm occurs.

Key decisions

  • Alternate selection inhibits the main recall request.
  • Motion is only enabled while the door is closed.
  • The selected recall output stays off once that landing is reached.
  • Door hold asserts when the car is at the selected recall landing.

When to reuse this

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.

FAQ

Frequently asked questions

What is alternate recall?01
It is an alternate landing selected when the primary recall floor is unsuitable.
Why require a closed door for recall motion?02
The example models a basic interlock so movement is not commanded with an open door.
Can this circuit be used in a real lift?03
No. Real fire service controls require certified, code-compliant equipment and design.
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