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ii)
If "Cache Connections" is enabled (checked), the connection
remains open after transmission. If disabled (unchecked), the
connection is opened before and closed after every transmission.
For efficiency, it is recommended to enable "Cache Connections".
e)
Click "OK" to close the MSG Configuration dialog. At this stage,
MainRoutine should look like Figure 80.
5)
Assign a tag to the XIO element.
a)
Double-click on the XIO element located to the left of the MSG block.
In the drop-down box, double-click on the "connection.EN" field. Refer
to Figure 81. This configuration causes the MSG instruction to
automatically retrigger itself when it completes. While this is
acceptable for the purposes of this example, it can produce high
network utilization. In actual practice, it may be desirable to
incorporate additional logic elements to allow triggering the MSG
instruction at a specific rate or under specific conditions.
Figure 80: MainRoutine
Figure 81: Configure XIO Element
80
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