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Automating Manufacturing Systems - Process Control and ...

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plc electrical - 31.21<br />

4. Why are nodes <strong>and</strong> wires labelled on a schematic, <strong>and</strong> in the controls cabinet?<br />

5. Locate at least 10 JIC symbols for the sensors <strong>and</strong> actuators in earlier chapters.<br />

6. How are shielding <strong>and</strong> grounding alike? Are shields <strong>and</strong> grounds connected?<br />

7. What are significant grounding problems?<br />

8. Why should grounds be connected in a tree configuration?

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