As input-values, four buttons stand for the respective floors. It doesn't matter in this case, whether somebody in the elevator presses the button 2nd level or somebody in the 2nd level calls the elevator.
As output-values, we have four signals, that declare, in which floor the elevator is now.
The machine contains 6 conditions:
Condition | Description | K | EC | 1 | 2 |
Keller | the machine is in the cellar | 1 | 0 | 0 | 0 |
Erdgeschoß vu | the machine is coming to the ground floor from below | 0 | 1 | 0 | 0 |
Erdgeschoß vo | the machine is coming to the ground floor from above | 0 | 1 | 0 | 0 |
1. Stock vu | coming from below the machine is in the 1.floor | 0 | 0 | 1 | 0 |
1. Stock vo | coming from upwards the machine is in the 1.floor | 0 | 0 | 1 | 0 |
2. Stock | the machine is in the 2. floor | 0 | 0 | 0 | 1 |
Is the elevator in the ground floor or 1. floor, so it shall, provided several buttons are pressed, proceed in the same direction first. Therefore two conditions were inserted for these floors for each case, that define from which direction the elevator is coming.
Transition-conditions:
If only one button is pressed, the elevator should go into this floor
of course. If several buttons are pressed, it should retain its direction
and should approach the next floor that has been called.
from | after | if |
Keller | Erdgeschoß vu | Knopf_EG |
Keller | 1. Stock | !Knopf_EG&Knopf_1 |
Keller | 2. Stock | !Knopf_EG & !Knopf_1&Knopf_2 |
Erdgeschoß vu | Keller | !Knopf_2 & !Knopf_2&Knopf_K |
Erdgeschoß vu | 1. Stock | Knopf_1 |
Erdgeschoß vu | 2. Stock | !Knopf_1&Knopf_2 |
and so on |