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Automating Manufacturing Systems - Process Control and ...

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plc states - 12.42<br />

7.<br />

a) block logic method<br />

door<br />

closed<br />

(state 3)<br />

remote OR button OR bottom limit<br />

remote OR button<br />

door<br />

closing<br />

(state 2)<br />

light sensor<br />

door<br />

opening<br />

(state 4)<br />

remote OR button<br />

door<br />

opened<br />

(state 1)<br />

remote OR button OR top limit<br />

www.PA<strong>Control</strong>.com

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