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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 />

state_1<br />

L1<br />

state_2<br />

state_4<br />

L2<br />

state_3<br />

L3<br />

state_3<br />

L4<br />

state_4<br />

state_2<br />

L5<br />

state_1<br />

L6<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<br />

active. The transition is S1 which will end state_1 <strong>and</strong> start state_2.<br />

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

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