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Automating Manufacturing Systems - Process Control and ...

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plc advanced functions - 16.35<br />

10. a) Timed, polled <strong>and</strong> fault, b) They remove the need to check for times or scan for memory<br />

changes, <strong>and</strong> they allow events to occur more often than the ladder logic is scanned. c) A few<br />

rungs of ladder logic might count on a value remaining constant, but an interrupt might change<br />

the memory, thereby corrupting the logic. d) The UID <strong>and</strong> UIE<br />

11.<br />

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File B<br />

<strong>Control</strong> c<br />

Bit c.UL<br />

Length 10<br />

MVM<br />

source B<br />

mask 0x03FF<br />

dest lights<br />

www.PA<strong>Control</strong>.com

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