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Automating Manufacturing Systems - Process Control and ...

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plc flowchart - 11.3<br />

START<br />

Open outlet valve<br />

Close inlet valve<br />

start button pushed?<br />

no<br />

yes<br />

Open inlet valve<br />

Close outlet valve<br />

Is tank full?<br />

yes<br />

Open outlet valve<br />

Close inlet valve<br />

no<br />

stop button pushed?<br />

no<br />

yes<br />

Figure 11.2<br />

A Flowchart for a Tank Filler<br />

The general method for constructing flowcharts is:<br />

1. Underst<strong>and</strong> the process.<br />

2. Determine the major actions, these are drawn as blocks.<br />

3. Determine the sequences of operations, these are drawn with arrows.

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