Publication 1769-UM009B-EN-P - May 2002
6-8 Using the 1769-SDN Scanner Module with CompactLogix Controllers
7. Click on the Output tab. The following screen appears:
The first 2 words (0 and 1) are read-only from the scanner’s
point of view, but are control words for the controller. Bit 0 of
output word 0 is used for control. It is the scanner’s Run bit.
When set (1), it places the scanner into Run mode. When the
scanner’s Run bit is a 0, the scanner is in Idle mode even if the
controller is in Run mode.
See also: Module Command Array on page 5-8.
The output data begins with word 2. This is where the actual
output data goes for the output modules in the 1769-ADN
adapter’s system.
TIP
The input and output data being exchanged by
the scanner and adapter is packed data. This
means that there is no special structure to it
that makes it obvious which I/O module it is
associated with.
To establish which data is from which module,
you must list the number of input and output
words each module has. Then, based on its
position in the I/O bank, you can determine
where any module’s data is in the controller’s
I/O tags.
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