Rockwell Automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual - Manual (Page 81)

Publication 1794-UM064B-EN-P - May 2014
Communicate With Your Module 69
Optimal sizes are the settings that provide optimal data to and from the I/O
modules. 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 setting 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.
Chapter Summary In this chapter you learned how to communicate with your module. Read the
next chapter to learn how to connect to the PROFIBUS DP network.