Table with flip flop The block diagram for an elevator controller for a building

Question

Table with flip flop

The block diagram for an elevator controller for a building with two floors is shown below. The inputs FBI and FB2 are floor buttons in the elevator. The inputs CALL1 and CALL2 are call buttons in the hall. The inputs FS1 and FS2 are floor switches that output a 1 when the elevator is at the first or second floor landing. Outputs UP and DOWN control the motor, and the elevator is stopped when UP = DOWN = 0. N1 and N2 are flip-flops that indicate when the elevator is needed on the first or second floor. R1 and R2 are signals that reset these flip-flops. DO = 1 causes the door to open, and DC = 1 indicates that the door is closed. Your design is only for the elevator control network. Four states are required. Implement your design using JK flip-flops. Deliverables: State Diagram State Table and Flip-flop Table Circuit Diagram

Explanation / Answer

I/P for Elevator Control Present State NextState Output Exitation i/p for flip flop N1 N2 FS1 FS2 DC A B A B R1 R2 Up Down D0 Da Db 0 1 1 0 1 0 0 0 1 1 1 0 0 1 0 1 x x x x X 0 1 1 1 0 0 1 0 0 1 1 1 0 0 1 1 1 1 1 0 1 1 0 0 1 1 0 x x x x X 1 0 0 0 0 0 0 1 0 0 0 1 0 1 0 x 0 0 0 0 1 1 0 0 1 0 0 0 1 0 1 x 1 1 1 1 1 1 0 0 1 1 1 in present state and next state,00=F11,00 indicate F11,its means the elevator in First floor, 11=F22,11 indicate F22,its means the elevator in Second floor, 01=F22,01 indicate F12,its means the elevator is moving up from first to second 10=F21,10 indicate F21,its means the elevator is moving down from second to first

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