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

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

plc timers - 9.23<br />

Solution:<br />

Motor<br />

Stop<br />

C5:0<br />

RES<br />

Go<br />

Motor<br />

CTU<br />

Preset 2<br />

Accum. 1<br />

C5:0<br />

C5:0/DN<br />

Stop<br />

Motor<br />

Motor<br />

Light<br />

Consider:<br />

- what will happen if stop is pushed <strong>and</strong> the motor is not running?<br />

Figure 9.24<br />

A Motor Starter Example<br />

9.7.4 Conveyor<br />

Problem: A conveyor is run by switching on or off a motor. We are positioning<br />

parts on the conveyor with an optical detector. When the optical sensor goes on, we want<br />

to wait 1.5 seconds, <strong>and</strong> then stop the conveyor. After a delay of 2 seconds the conveyor<br />

will start again. We need to use a start <strong>and</strong> stop button - a light should be on when the system<br />

is active.

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

Saved successfully!

Ooh no, something went wrong!