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Automating Manufacturing Systems - Process Control and ...

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plc states - 12.52<br />

method that is not based on equations.<br />

FS<br />

START<br />

STB<br />

STA<br />

5s delay<br />

RESET<br />

DONE<br />

STOP<br />

STE<br />

FAULT<br />

STD<br />

LIMIT<br />

STC<br />

9. The state diagram below is for a simple elevator controller. a) Develop a ladder logic program<br />

that implements it with Boolean equations. b) Develop the ladder logic using the block logic<br />

technique. c) Develop the ladder logic using the delayed update method.<br />

up_request<br />

move<br />

up<br />

at_floor<br />

pause<br />

up<br />

FS<br />

idle<br />

up_request<br />

down_request<br />

door_closed<br />

door_closed<br />

down_request<br />

move<br />

down<br />

at_floor<br />

pause<br />

down<br />

10. Write ladder logic for the state diagram below a) using an equation based method. b) without

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