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Automating Manufacturing Systems - Process Control and ...

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plc timers - 9.42<br />

19.<br />

First scan<br />

T4:0/TT<br />

T4:2/TT<br />

T4:2/DN<br />

T4:1/DN<br />

TON<br />

T4:0<br />

delay 15s<br />

TON<br />

T4:1<br />

delay 0.5s<br />

TON<br />

T4:2<br />

delay 0.5s<br />

light<br />

20.<br />

start<br />

active<br />

stop<br />

active<br />

enter<br />

exit<br />

active<br />

C5:0/DN<br />

CTU<br />

counter C5:0<br />

preset 10<br />

CTD<br />

counter C5:0<br />

preset 10<br />

active<br />

21. The normal output ‘Y’ is repeated twice. In this example the value of ‘Y’ would always match<br />

‘B’, <strong>and</strong> the earlier rung with ‘A’ would have no effect on ‘Y’.

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