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Automating Manufacturing Systems - Process Control and ...

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plc basic functions - 15.20<br />

Figure 15.20 shows a numberline that helps determine when the LIM function will<br />

be true.<br />

high limit<br />

low limit<br />

low limit<br />

high limit<br />

Figure 15.20<br />

A Number Line for the LIM Function<br />

File to file comparisons are also permitted using the FSC instruction shown in Figure<br />

15.21. The instruction uses the control word R6:0. It will interpret the expression 10<br />

times, doing two comparisons per logic scan (the Mode is 2). The comparisons will be<br />

F8:10

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