Your client has a multi-story, multi- tenant building and requires elevator control with an after-hours feature that provides feedback noting which floor(s) the after-hours user chooses.
The Mercury definition:
The Elevator Control feature allows the control of the floor choices a valid user is permitted to make; and once a selection occurs, it provides the host system with feedback as to what floor was selected.
The Mercury answer:
Using the Mercury EP1502 or EP2500 in conjunction with any of the MR family of I/O boards, you can configure the after-hours elevator cab to a both the output side of a controller to enable floor selection of the cab’s panel and to the input side of a panel to provide the feedback data of the floor(s) selected. It is important to note that the wiring of outputs and inputs does not have land on the same I/O panel. Mercury’s intelligent controller allows this feedback linking to happen logically no matter what panels are called into play beneath the controller management.