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Automating Manufacturing Systems - Process Control and ...

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plc basic functions - 15.32<br />

S2<br />

part detect<br />

C5:0/DN<br />

MCR<br />

CTD<br />

counter C5:0<br />

preset 0<br />

L<br />

S3<br />

U<br />

S2<br />

MCR<br />

S3<br />

reset<br />

MCR<br />

L<br />

S1<br />

U<br />

S3<br />

MCR<br />

7. an incremental mode will do one calculation when the input to the function is a positive edge -<br />

goes from false to true. The all mode will attempt to complete the calculation in a single scan.<br />

If a number is used, the function will do that many calculations per scan while the input is true.<br />

8. The maximum number is 1000. If the instruction takes too long the instruction may be paused<br />

<strong>and</strong> continued the next scan, or it may lead to a PLC fault because the scan takes too long.

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