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1747-6.22, Backup Scanner User Manual

1747-6.22, Backup Scanner User Manual

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0017<br />

Programming Techniques 9-171<br />

This rung copies the Virtual DTHW word (B3:4) to the actual DTHW word (M0:1.3411) located in the <strong>1747</strong>-BSN module. M-file accesses are interrupts to the processor and<br />

using virtual words minimizes M-file accesses and therefore minimizes the effects of these transfers on the ladder program scan time.<br />

Virtual & Actual<br />

DTHW Words<br />

MOV<br />

Move<br />

Source B3:4<br />

0000000000000000<<br />

Dest M0:1.3411<br />

?<<br />

0018 END<br />

Publication <strong>1747</strong>-<strong>6.22</strong>

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