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Automating Manufacturing Systems - Process Control and ...

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plc states - 12.22<br />

THE STATE EQUATIONS<br />

ST1<br />

ST1<br />

ST1X<br />

ST4<br />

T4:2/DN<br />

S1<br />

first scan<br />

S2<br />

ST2<br />

ST2<br />

ST2X<br />

ST1 S1 S2<br />

T4:1/DN<br />

ST3<br />

ST2<br />

T4:1/DN<br />

ST3<br />

S1<br />

ST3X<br />

S2<br />

ST4<br />

ST4<br />

ST4X<br />

ST3 S1 S2<br />

T4:2/DN<br />

ST1X<br />

ST2X<br />

ST3X<br />

ST4X<br />

ST1<br />

ST2<br />

ST3<br />

ST4<br />

Figure 12.24<br />

Delayed State Updating<br />

When multiple transitions out of a state exist we must take care to add priorities.

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