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Automating Manufacturing Systems - Process Control and ...

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plc states - 12.34<br />

12.4 PRACTICE PROBLEM SOLUTIONS<br />

1.<br />

Timer Done + Cancel Button + Door Open<br />

IDLE<br />

Time Button<br />

COOK<br />

Time Button<br />

Cancel Button<br />

Power Button<br />

CLOCK<br />

SET<br />

Start Button<br />

COOK<br />

TIME SET<br />

2.<br />

T1<br />

T2<br />

=<br />

=<br />

FS<br />

S1( BA)<br />

T3 = S2( EC ( + D+<br />

F)<br />

)<br />

T4 = S1( F+<br />

E)<br />

T5 = S0( AC ( + D)<br />

)<br />

S1 = ( S1 + T1 + T3 + T5)T2T4<br />

S2 = ( S2 + T2)T3<br />

S0 = ( S0 + T4T2)T5<br />

P = S1 + S2<br />

Q = S0 + S2<br />

R = S0 + S1

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