Publication 1794-6.5.12 - November 1997
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5-11
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 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 Thermocouple/RTD input
module, you have 11 input words, and 4 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 information on using DeviceNetManager software to configure your
adapter, refer to the DeviceNetManager Software User Manual,
publication 1787-6.5.3.
Chapter Summary In this chapter, you learned how this module communicates over the
DeviceNet, and the image table mapping for the module.
Module Defaults for: Factory Defaults Real Time Size
Catalog
Number
Description
Input
Default
Output
Default
Input
Default
Output
Default
1794-IRT8 8-Input Thermocouple/RTD Input 11 4 8 0
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