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discrete sensors - 4.36<br />

9.<br />

L1<br />

N<br />

stop<br />

start<br />

MCR<br />

C1<br />

C1<br />

PB1<br />

PB2<br />

PR1<br />

L1<br />

I.0<br />

I.1<br />

I.2<br />

PLC<br />

N<br />

Vac<br />

O.0<br />

O.1<br />

L1<br />

L2<br />

C1<br />

I.3<br />

com<br />

O.2<br />

O.3<br />

V+ V-<br />

L1<br />

N<br />

4.7 ASSIGNMENT PROBLEMS<br />

1. What type of sensor should be used if it is to detect small cosmetic case mirrors as they pass<br />

along a belt. Explain your choice.<br />

2. Summarize the tradeoffs between capacitive, inductive <strong>and</strong> optical sensors in a table.<br />

3. Clearly <strong>and</strong> concisely explain the difference between wiring PNP <strong>and</strong> NPN sensors.<br />

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

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