How do I model a building where not all the elevators serve all the floors?
Except in exceptional circumstances, all cars in a group should serve all floors. This is because:
1. Service to and from the floors not served by all the elevators will be poor.
For example, consider a four car system with a Round Trip Time (RTT) of about 120 seconds where all the cars serve all the floors. The elevator system presents passengers with an interval of (120 sec /4) which is 30 sec. If only one car serves the basement car park, someone traveling to or from the basement only has one car available to them - for these passengers the interval is approximately equal to the RTT, 120 sec. This represents an extremely poor service.
2. Service to the floor not served by all the elevators relies on the "correct" car being sent to answer the call.
This can be resolved by having separate or additional call buttons. For example, there may be an additional button on each landing to call the "Car Park Elevator". The disadvantage of this approach is that passengers will tend to press two hall call buttons, and so call two cars. This deteriorates the service for other passengers. This problem can be overcome with destination dispatch, but the service will still be poor for the reasons discussed in (1).
If you have not option but to take this unsatisfactory approach, a rough guide to performance can be assessed using RTT calculations as indicated in (1).
Using simulation, you can model not all cars serving all floors (Passenger Data, Advance Mode, Floors Served tab). This is explained in the manual. If you need further assistance, please contact us.