Rockwell Automation Ethernet Design Considerations Reference Manual - 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.