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Automating Manufacturing Systems - Process Control and ...

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plc states - 12.26<br />

UPDATE TIMERS<br />

ST4<br />

timer on<br />

t_st4<br />

delay 4 sec<br />

ST2<br />

CALCULATE TRANSITION EQUATIONS<br />

ST4 t_st4.DN<br />

timer on<br />

t_st2<br />

delay 4 sec<br />

T4<br />

ST1 S1 S2 T1<br />

ST2<br />

t_st2.DN<br />

T2<br />

ST3 S1 S2 T3<br />

FS<br />

T5<br />

Figure 12.28<br />

Ladder Logic for the State-Transition Equations<br />

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