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plc memory - 14.18<br />

10.<br />

first scan<br />

RTF<br />

T4:1<br />

delay 15 s<br />

T4:1/DN<br />

RTO<br />

T4:2<br />

delay 0.5 s<br />

T4:2/DN<br />

RTO<br />

T4:3<br />

delay 0.5 s<br />

T4:3/DN<br />

T4:2<br />

RES<br />

T4:3/DN<br />

T4:3<br />

RES<br />

T4:2/DN T4:1/DN O/1<br />

11. three memory words are used for a timer or a counter.<br />

14.8 ASSIGNMENT PROBLEMS<br />

1. Briefly list <strong>and</strong> describe the different methods for addressing values (e.g., word, bit, literal,<br />

etc.).<br />

2. Could timer ‘T’ <strong>and</strong> counter ‘C’ memory types be replaced with control ‘R’ memory types?<br />

Explain your answer.

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