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Automating Manufacturing Systems - Process Control and ...

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plc flowchart - 11.9<br />

F2<br />

start<br />

MCR<br />

U<br />

F2<br />

L<br />

F3<br />

F3<br />

MCR<br />

MCR<br />

U<br />

outlet<br />

L<br />

inlet<br />

U<br />

F3<br />

L<br />

F4<br />

MCR<br />

Figure 11.7<br />

Ladder Logic for Flowchart Operations F2 <strong>and</strong> F3<br />

The ladder logic for operation F4 turns off F4, <strong>and</strong> if the tank is full it turns on F6,<br />

otherwise F5 is turned on. The ladder logic for operation F5 is very similar.

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