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 states - 12.12<br />

SECOND STATE WAIT FOR TRANSITIONS<br />

state_2<br />

MCR<br />

TON<br />

t_st2<br />

delay 4 s<br />

t_st2.DN<br />

t_st2.DN<br />

state_2<br />

U<br />

state_3<br />

L<br />

MCR<br />

Figure 12.13<br />

Ladder Logic for Second State<br />

The third <strong>and</strong> fourth states are shown in Figure 12.14 <strong>and</strong> Figure 12.15. Their layout<br />

is very similar to that of the first two states.<br />

THIRD STATE WAIT FOR TRANSITIONS<br />

state_3<br />

MCR<br />

S2<br />

S2<br />

state_3<br />

U<br />

state_4<br />

L<br />

MCR<br />

Figure 12.14<br />

Ladder Logic for State Three<br />

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

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

Saved successfully!

Ooh no, something went wrong!