Rockwell-automation Ethernet Design Considerations Reference Manual Instrukcja Użytkownika Pobierz pdf (Strona 80)

80 Rockwell Automation Publication ENET-RM002C-EN-P - May 2013

Chapter 5 Predict System Performance

System Prediction Goals

You allocate the bandwidth of your EtherNet/IP communication module

between two types of messaging.

The performance predictions have two major goals:

• Determine if the system as a whole has sufficient bandwidth and

connections to meet application requirements.

• Estimate the maximum input or output times for rack-optimized

connections, direct connections, and produced/consumed tags.

Messaging Type Description

Explicit messaging Explicit messages are connections that do not use an RPI.

Some examples of explicit messaging include the following:

• MSG instructions

• HMI communication

• Studio 5000 uploads and downloads

Implicit messaging Implicit messages are connections that use an RPI.

Implicit messaging is used for I/O data exchanges, including the following:

• Rack-optimized connections

(1)

• Direct connections

• Produced/consumed tags

(1) Available with digital I/O modules only.

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Rockwell-automation Ethernet Design Considerations Reference Manual Instrukcja Użytkownika Strona 80