Upgrade to latest firmware revision, Monitor packet sizes in current application, Requested packet interval (rpi) – Rockwell Automation Ethernet Design Considerations Reference Manual User Manual
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Rockwell Automation Publication ENET-RM002C-EN-P - May 2013
Chapter 4
EtherNet/IP Protocol
Upgrade to Latest Firmware Revision
All ControlLogix EtherNet/IP communication modules must be upgraded to
firmware revision 3.
x or later to increase their packet rate capacity. You can
upgrade your module’s firmware regardless of series.
Download the latest firmware revisions at the Rockwell Automation technical
support website.
Monitor Packet Sizes in Current Application
Some EtherNet/IP communication modules offer web pages that show module
and application information. To view your module’s information, type the
module’s IP address into your web browser.
For more information on packet rate capacity on ControlLogix EtherNet/IP
communication modules, see Article ID 66326, ControlLogix 1756-EN
xxx V3.x
performance increase FAQ, available from the Rockwell Automation
Knowledgebase at
.
Requested Packet
Interval (RPI)
The RPI is the update rate specified for a particular piece of data on the network.
The RPI can be specified for an entire rack via a rack-optimized connection or for
a particular module via a direct connection.
When adding a module to the I/O configuration of a controller, you must
configure the RPI. This value specifies how often to produce the data for that
module. For example, if you specify an RPI of 50 ms, every 50 ms the I/O module
sends its data to the controller or that the controller sends its data to the I/O
module.
RPIs are used for only implicit connections, such as produced/consumed tags
and I/O. For example, a local EtherNet/IP communication module does not
require an RPI because it does not produce data for the system but acts as a bridge
to remote modules.
Set the RPI only as fast as needed by the application. The CompactLogix 5370
controllers always attempt to scan an I/O module at the configured RPI rate. For
guidelines on setting the RPI for the CompactLogix 5370 controllers, see the
CompactLogix 5370 Controllers User Manual, publicat
The RPI also determines the number of packets per second that the module
produces on a connection. Each module has a limit on the total number of
implicit packets per second. The total includes the sum of sent and received
implicit packets. The packet rate capacity for implicit messages is for only
implicit packets and neither matches nor includes the explicit packet rate
capacity.