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Automating Manufacturing Systems - Process Control and ...

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plc states - 12.12<br />

SECOND STATE WAIT FOR TRANSITIONS<br />

B3/2 MCR<br />

T4:1<br />

RTO<br />

delay 4 s<br />

T4:1/DN B3/2<br />

T4:1/DN B3/3<br />

U<br />

L<br />

T4:1/DN T4:1<br />

RST<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.

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