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Automating Manufacturing Systems - Process Control and ...

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plc flowchart - 11.12<br />

START<br />

F1<br />

T1<br />

Open outlet valve<br />

Close inlet valve<br />

T2<br />

F2<br />

is the NO<br />

start button pushed?<br />

no<br />

F3<br />

yes<br />

T3<br />

Open inlet valve<br />

Close outlet valve<br />

F4<br />

T4<br />

Is tank full?<br />

yes<br />

T6<br />

F6<br />

Open outlet valve<br />

Close inlet valve<br />

F5<br />

T5<br />

no<br />

is the NC<br />

stop button pushed?<br />

yes<br />

no<br />

Figure 11.10<br />

Label the Flowchart Blocks <strong>and</strong> Arrows<br />

The first section of ladder logic is shown in Figure 11.11. This indicates when the<br />

transitions between functions should occur. All of the logic for the transitions should be<br />

kept together, <strong>and</strong> appear before the state logic that follows in Figure 11.12.<br />

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

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