Elevator Wiring With Access Control IO Board

We have unexperienced on elevator access control installation so far.

For Elevator access control, manufacturers generally provide relay IO module to interface with elevator to control floor key button.

can you provide the wiring and installation detail on how AC IO board relay interfaced with elevator for floorwise access control?

and I am worried about recent elevator design (from Otis/Kone/schindler etc.) supports Relay board interface ?


Most modern elevator controllers, certainly including Otis/Kone/Schindler/Thyssen/Fujitec, sometimes with the addition of security modules made by the elevator manufacturer, allow individual floor control by sending a dry contact from the access control system. The exact wiring depends on the individual elevator system; sometimes they are closed contact to secure and sometimes open contact to secure. Either way, it is usually straightforward wiring between relays on the access system and inputs on the elevator system. Usually there is one common per elevator car, so this gets jumpered between the common terminals of all the access relays assigned to a single car. The number of control wires per car is the number of secure floors plus one.

It is generally only with older elevator controllers that more involved wiring required, with access relays interrupting the floor select buttons themselves.

Some elevator systems and access systems also allow high level elevator floor control, with IP data transfer that determines floor access instead of hardwired relays.

Some clients want the additional level of security of receiving a signal back from the elevator system to indicate which floor was selected. Not all access systems have the functionality to associate that with the card read to create a floor access event.

Thank you Dan...!

As you said "The number of control wires per car is the number of secure floors plus one" why it is like that ?

in traditional relay based elevator access control, is it possible to provide information of which floor is selected based on receiving signal from elevator system ?

Please share any available doc or web link if possible for in detail understanding.

Sundar,

As you said "The number of control wires per car is the number of secure floors plus one" why it is like that ?

There is generally one common for each car in the elevator equipment. At the access control relays, this common gets jumpered between the common terminals of all the relays serving that car. Then there is a wire for each secure floor served by that elevator. For example, in a building with 10 stories all served by 3 elevators, with the lobby level would be always open to allow people out: You would have conductors between the access control and elevator control consisting of Car 1 Common, Car 1 Floor 2, Car 1 Floor 3, ..., Car 1 Floor 10, Car 2 Common, Car 2 Floor 2, ..., Car 2 Floor 10, Car 3 Common, Car 3 Floor 2, ..., Car 3 Floor 10. 9 secure floors per car, 10 wires per car. Plus the card reader wiring, of course. Typically, a separate set of cables for each car.

in traditional relay based elevator access control, is it possible to provide information of which floor is selected based on receiving signal from elevator system ?

Yes, we have done this for many high rise office buildings where there are multi-floor tenants and it is desirable to be able to determine which floor was accessed. This requires an additional set of cabling, equal to that used for floor control. The access control system must have the ability to associate the card read event with the input from the elevator system. Also, the elevator system must have the ability to output the floor selection; many of the elevator techs I have encountered are unaware of how to accomplish this. Though useful, this is not a perfect system as there could be multiple people in the elevator and it is impossible to know from the information given who pressed what button. This is part of why elevator security should not be the only barrier to a secure space; there should be locked doors on each floor.

For diagrams, please send me a message via the email button next to my name and I will see what I can come up with.