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Automating Manufacturing Systems - Process Control and ...

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plc wiring - 3.28<br />

16.<br />

relay output card<br />

00<br />

+<br />

-<br />

power<br />

supply<br />

24Vdc<br />

01<br />

02<br />

03<br />

hot<br />

neut.<br />

power<br />

supply<br />

120Vac<br />

04<br />

+<br />

-<br />

power<br />

supply<br />

12Vdc<br />

3.9 ASSIGNMENT PROBLEMS<br />

1. Describe what could happen if a normally closed start button was used on a system, <strong>and</strong> the<br />

wires to the button were cut.<br />

2. Describe what could happen if a normally open stop button was used on a system <strong>and</strong> the wires<br />

to the button were cut.<br />

3. a) For the input (’in’) <strong>and</strong> output (’out’) cards below, add three output lights <strong>and</strong> three normally<br />

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

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