Rockwell-automation 1738-AENTR, Series B POINT I/O and ArmorPOINT I/O Manual de usuario descargar pdf (Pagina 16)

8 Rockwell Automation Publication 1734-UM017B-EN-P - October 2013

Chapter 1 Overview of the 1734 POINT and 1738 ArmorPOINT EtherNet/IP Adapters

Rack-optimized connections reduce the total number of connections needed to

transfer data when using many digital I/O modules in a system. The following

example illustrates the benefit of rack-optimized connections.

Assume you set up a system that contains eight digital I/O modules interfaced to

an adapter. If you use direct connections to transfer data to each of the these I/O

modules, you need eight connections to transfer all of the data, one to each of the

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 Embedded Switch Technology Application Guide,

publication ENET-AP005

, for more 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.

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Rockwell-automation 1738-AENTR, Series B POINT I/O and ArmorPOINT I/O Manual de usuario Pagina 16