Rockwell Automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User Manual - Manual (Page 86)

2–66 How Communication Takes Place and I/O Image Table Mapping
Publication 1794ĆUM057B-EN-P - November 2001
Optimal Sizes Adapter Defaults Module Defaults for:
Output
Default
Input
Default
Output
Default
Input
Default
Description
Catalog
Number
1794-IRT8 TC/mV/RTD Module 11 4 1 0
1794-IF4I 4 Isolated Input Module 7 8 1 0
1794-OF4I 4 Isolated Output Module 6 9 0 1
1794-IF2XOF2I Isolated Combo Module 7 7 1 1
1794-ID2 Incremental Encoder Module 8 7 1 0
1794-IP4 Pulse Counter Module 10 3 1 0
1203ĆFM1 SCANport Module 6 5 4 3
The default values reflect the maximum number of read/write 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
optimal sizes.
Optimal sizes are the settings that provide optimal data to and from
the I/O module. You need a software configuration tool to change the
size. Make sure the FLEX I/O adapter is compatible with the
configuration tool you choose.
The optimal settings provide the fastest network time by only
mapping read and write words used by the I/O modules. If you
reduce your data sizes to only include optimal data, you can only
change your configuration data with a software tool. If you need to
change configuration information on an optimal basis, your data size
must be large enough to include the necessary words.