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Automating Manufacturing Systems - Process Control and ...

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plc states - 12.49<br />

12.5 ASSIGNMENT PROBLEMS<br />

1. Describe the difference between the block logic, delayed update, <strong>and</strong> transition equation methods<br />

for converting state diagrams to ladder logic.<br />

2. Write the ladder logic for the state diagram below using the block logic method.<br />

FS<br />

ST1<br />

A<br />

B<br />

ST2<br />

D<br />

ST3<br />

C<br />

3. Convert the following state diagram to ladder logic using the block logic method. Give the stop<br />

button higher priority.<br />

ST0: idle<br />

A<br />

STOP<br />

ST1: X on<br />

B<br />

STOP<br />

D + STOP<br />

ST3: Z on<br />

C<br />

ST2: Y on<br />

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