Publication 1794-6.5.8 - January 2010
Communication and I/O Image Table Mapping with the DeviceNet/ControlNet Adapter 97
Defaults
Each I/O module has default values associated with it. At default, each
module will generate inputs/status and expect outputs/configuration.
Factory defaults are the values available by the adapter.
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. These values appear when you:
• first power up the system, and
• no previous stored settings have been applied.
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, a 4
input analog module has 7 words input/8 words output. You can
reduce the input words to 4 by not using the real time sample,
module status or channel status. Likewise, you can reduce the write
words to 0, thus eliminating the conversion rate/filter settings, channel
range/data format, real time sample interval and
configuration/calibration and unused words.
Module Defaults for: Actual Defaults
Catalog
Number
Description Input
Default
Output
Defaults
Input
Defaults
Output
Defaults
1794-IF4I 4-pt Isolated Analog Input 8 7 4 0
1794-OF4I 4-pt Isolated Analog Output 6 9 4 5
1794-IF2XOF2I 2 in/2 out Isolated Analog
Combo
7842
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