System prediction goals – Rockwell Automation Ethernet Design Considerations Reference Manual User Manual
Page 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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