1. Extension board use for following elevator
2. logic board.
3. No supply voltage requirement.
4. On board number of stops 8. (8 landing call & 8 car call).
5. Maximum 4 cards we use at a time.
6. Easy connection with Main logic board & other
7. extension card with the FRC (Flat Ribbon Cable).
8. Status of all inputs & outputs though LED indication on board.
9. If we have to use Extension card, then it is
10. compulsory to change the parameter of CARD NO in Main Elevator Logic board.
If we use one extension card then
CARD NO = 01.