12.05.2014 Views

Automating Manufacturing Systems - Process Control and ...

Automating Manufacturing Systems - Process Control and ...

Automating Manufacturing Systems - Process Control and ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

discrete sensors - 4.30<br />

forget to include hard-wired start <strong>and</strong> stop buttons with an MCR.<br />

L1<br />

N<br />

L1<br />

PLC<br />

N<br />

I:0/0<br />

I:0/1<br />

I:0/2<br />

I:0/3<br />

com<br />

Vac<br />

O:0/0<br />

O:0/1<br />

O:0/2<br />

O:0/3<br />

4.6 PRACTICE PROBLEM SOLUTIONS<br />

1. capacitive proximity, contact switch, photo-optic retroreflective/diffuse, ultrasonic<br />

2. materials that can be sensed, environmental factors such as dirt, distance to object<br />

3. the sinking output will pass only DC in a single direction, whereas a switch can pass AC <strong>and</strong><br />

DC.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!