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plc advanced functions - 16.17<br />

A<br />

X<br />

UID<br />

B<br />

FAL<br />

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

length 5<br />

position 0<br />

Mode all<br />

Destination n[5 + c.POS]<br />

Expression n[c.POS] + 5<br />

UIE<br />

Figure 16.16<br />

Disabling Interrupts<br />

16.4 INPUT AND OUTPUT FUNCTIONS<br />

16.4.1 Immediate I/O Instructions<br />

The input scan normally records the inputs before the program scan, <strong>and</strong> the output<br />

scan normally updates the outputs after the program scan, as shown in Figure 16.17.<br />

Immediate input <strong>and</strong> output instructions can be used to update some of the inputs or outputs<br />

during the program scan.<br />

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

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