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Automating Manufacturing Systems - Process Control and ...

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plc flowchart - 11.8<br />

STEP 3: Write ladder logic for each function in the flowchart<br />

F1<br />

MCR<br />

L<br />

outlet<br />

U<br />

inlet<br />

U<br />

L<br />

F1<br />

F2<br />

MCR<br />

Figure 11.6<br />

Ladder Logic for the Operation F1<br />

The ladder logic for operation F2 is simple, <strong>and</strong> when the start button is pushed, it<br />

will turn off F2 <strong>and</strong> turn on F3. The ladder logic for operation F3 opens the inlet valve <strong>and</strong><br />

moves to operation F4.

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