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Automating Manufacturing Systems - Process Control and ...

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plc states - 12.10<br />

blocks they could only be on when the MCR block was active, otherwise they would be<br />

forced off. Note: Many beginners will make the careless mistake of repeating outputs in<br />

this section of the program.<br />

TURN ON LIGHTS AS REQUIRED<br />

B3/1<br />

O/1<br />

B3/2<br />

B3/4<br />

O/2<br />

B3/3<br />

O/3<br />

B3/3<br />

O/4<br />

B3/4<br />

B3/2<br />

O/5<br />

B3/1<br />

O/6<br />

Figure 12.11<br />

General Output <strong>Control</strong> Logic<br />

The first state is implemented in Figure 12.10. If state 1 is active this will be active.<br />

The transition is S1 or I/1 which will end state 1 B3/1 <strong>and</strong> start state 2 B3/2.

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