Question

I am trying to write a ladder logic diagram for two floors elevator. The elevator has open door, close door, optic sensor, open limit switch, close limit switch, up call, down call, elevator up and elevator down inputs. The outputs: opened door, closed door, 1st floor and 2nd floor. When call down is depressed, it has to show where the elevator at that particular time (1st floor or second floor). If it is on the first floor, the door will open, but if it is the second floor, the elevator needs to come down to the 1st floor and open. The problem, I have I couldn't figure out to write ladder logic for the conditons as well as showing the position of the elevator. I mean when I am on the first floor, I need to see the location of the elevator ( either 1st floor or 2nd floor). So, I want to find a way to show the location of the elevator using a ladder logic.

I just need a simple ladder logic that explains the conditions above since I already have done the open, closed, up and down ladder logic.

Thanks

Answer 1