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Automating Manufacturing Systems - Process Control and ...

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plc states - 12.20<br />

DEFINE THE TIMERS<br />

ST4<br />

timer on<br />

t_st4<br />

delay 4 sec<br />

ST2<br />

THE STATE EQUATIONS<br />

ST1<br />

ST1<br />

timer on<br />

t_st2<br />

delay 4 sec<br />

ST1X<br />

ST4<br />

t_st2.DN<br />

S1<br />

first scan<br />

S2<br />

ST2<br />

ST2<br />

ST2X<br />

ST1 S1 S2<br />

t_st4.DN<br />

ST3<br />

ST2<br />

t_st4.DN<br />

ST3<br />

S1<br />

ST3X<br />

S2<br />

ST4<br />

ST4<br />

ST4X<br />

ST3 S1 S2<br />

t_st2.DN<br />

Figure 12.22<br />

Ladder Logic for the State Equations<br />

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

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