Rockwell Automation Logix5000 Controllers Tasks, Programs, and Routines Programming Manual - Manual (Page 57)

Manage event tasks Chapter 2
Description
In Controller A, logic updates the values of a produced tag.
Once the update is complete, the Controller A runs an IOT instruction to send the data and an event trigger
to Controller B.
Controller B consumes the new data.
After Controller B updates the consumed tag, it runs the event task.
The type of network between the controllers determines when the consuming
controller receives the new data and event trigger through the IOT instruction.
The following table lists the times when the consuming device receives the new
data and event trigger.
With this controller Over this network The consuming device receives the data and event
trigger
ControlLogix Backplane Immediately
EtherNet/IP network Immediately
ControlNet network Within the actual packet interval (API) of the consumed
tag (connection)
SoftLogix5800 You can produce and consume tags only over a ControlNet
network Within the actual packet interval (API) of the consumed
tag (connection)
The following diagrams compare the receipt of data via an IOT instruction over
EtherNet/IP and ControlNet networks.
EtherNet/IP Network (ControlLogix controller) ControlNet Network
Rockwell Automation Publication 1756-PM005-EN-P - October 2014 57