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Automating Manufacturing Systems - Process Control and ...

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plc timers - 9.44<br />

of all the timers <strong>and</strong> counters are reset to begin with.<br />

A<br />

TON<br />

Timer T4:0<br />

Base 1s<br />

Preset 2<br />

RTO<br />

Timer T4:1<br />

Base 1s<br />

Preset 2<br />

TOF<br />

Timer T4:2<br />

Base 1s<br />

Preset 2<br />

CTU<br />

Counter C5:0<br />

Preset 2<br />

Acc. 0<br />

CTD<br />

Counter C5:1<br />

Preset 2<br />

Acc. 0<br />

A<br />

T4:0/DN<br />

T4:1/DN<br />

T4:2/DN<br />

C5:0/DN<br />

C5:1/DN<br />

0 5 10 15 20<br />

t(sec)<br />

2. Write a ladder logic program that will count the number of parts in a buffer. As parts arrive they<br />

activate input A. As parts leave they will activate input B. If the number of parts is less than 8<br />

then a conveyor motor, output C, will be turned on.

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