Mixing rack-optimized and direct connections, Chapter summary – Rockwell Automation 1738-AENTR, Series A 1734 POINT I/O and 1738 ArmorPOINT I/O 2 Port Ethernet/IP Adapter User Manual User Manual
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Rockwell Automation Publication 1734-UM014B-EN-P - June 2013
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About the Adapters Chapter 1
eight I/O modules. If you use a rack-optimized connection to transfer the data,
you only need a single connection – the connection to the I/O adapter.
See the EtherNet/IP Design Considerations Reference Manual,
publicat
re information on connections.
Mixing Rack-optimized and Direct Connections
You can mix communication formats for different I/O modules communicating
through the same adapter. I/O modules set up to use rack optimization
communicate at the rate of the RPI configured for the adapter. I/O modules
configured for direct communication communicate at their own individual RPIs
and ignore the rack-optimized RPI.
Chapter Summary
In this chapter, you were introduced to the features of the POINT I/O and
ArmorPOINT I/O Adapters, and considerations for installation and usage.
IMPORTANT
Although rack-optimized connections offer an efficient way to use
resources, there are a few limitations on their use:
• You can use only rack-optimized connections to send data to and
from digital I/O modules. Analog or speciality I/O requires direct
connections.
• All data is sent at the same time as the RPI rate of the I/O adapters.
If the update rate required for a digital module is different from the
RPI of the rack-optimized connection, a direct connection to that
digital I/O module is required.