5–12
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Publication
17946.5.2 - May 1996
Each I/O module has default values associated with it. At default,
each module will generate inputs/status and expect
outputs/configuration.
Module Defaults for: Factory Defaults Real Time Size
Catalog
Number
Description
Input
Default
Output
Default
Input
Default
Output
Default
1794IE8/B 8pt Analog Input 9 6 8 0
1794OE4/B 4pt Analog Output 1 14 0 4
1794IE4XOE2/B 4 in/2 out Analog Combo 5 10 4 2
Factory defaults are the values assigned by the adapter when you:
• first power up the system, and
• no previous stored settings have been applied.
For analog modules, the defaults reflect the actual number of input
words/output words. For example, for the 8 input analog module,
you have 9 input words, and 6 output words.
You can change the I/O data size for a module by reducing the
number of words mapped into the adapter module, as shown in real
time sizes.”
Real time sizes are the settings that provide optimal real time data to
the adapter module.
Analog modules have 15 words assigned to them. This is divided
into input words/output words. You can reduce the I/O data size to
fewer words to increase data transfer over the backplane. For
example, an 8 input analog module has 9 words input/6 words output
with factory default. You can reduce the input words to 8 by not
using the underrange settings set in word 9. Likewise, you can
reduce the write words to 0, thus eliminating the configuration
setting and unused words.
For information on using DeviceNet Manager software to configure
your adapter, refer to the DeviceNet Manager Software User
Manual, publication 1787-6.5.3.
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