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Automating Manufacturing Systems - Process Control and ...

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plc analog - 22.25<br />

5.<br />

A card with a voltage range from -10V to +10V will be selected to cover the<br />

entire range.<br />

10V – (–<br />

10V)<br />

R = --------------------------------- = 400<br />

0.050V<br />

minimum resolution<br />

8 bits = 256<br />

9 bits = 512<br />

10 bits = 1024<br />

The A/D converter needs a minimum of 9 bits, but this number of bits is not<br />

commonly available, but 10 bits is, so that will be selected.<br />

⎛ ⎞ V ERROR<br />

=<br />

V max<br />

– V<br />

---------------------------- min 10V – (–<br />

10V)<br />

=<br />

2R<br />

2( 1024)<br />

= ± 0.00976V<br />

⎝<br />

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