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Automating Manufacturing Systems - Process Control and ...

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plc sfc - 20.9<br />

transition 5<br />

top limit<br />

L<br />

step 6<br />

U<br />

transition 5<br />

transition 6<br />

part detected<br />

L<br />

step 2<br />

PERFORM ACTIVITIES FOR STEPS<br />

step 2<br />

U<br />

L<br />

transition 6<br />

power<br />

step 3<br />

L<br />

L<br />

light<br />

advance<br />

step 4<br />

L<br />

L<br />

part hold<br />

retract<br />

step 5<br />

U<br />

U<br />

advance<br />

light<br />

U<br />

advance<br />

U<br />

power<br />

Figure 20.7<br />

SFC Implemented in Ladder Logic

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