Rockwell Automation Publication 1769-UM011H-EN-P - April 2012 75
Chapter 5
Manage Controller Communication
This chapter explains how to manage controller communication.
Produce and Consume Data
The controller supports the ability to produce (broadcast) and consume (receive)
system-shared tags over ControlNet or EtherNet/IP networks. Produced and
consumed tags each require connections. Over ControlNet, produced and
consumed tags are scheduled connections.
Figure 10 - Controller Communication Overview
For two controllers to share produced or consumed tags, both controllers must be
attached to the same control network, such as a ControlNet or Ethernet/IP
network. You cannot bridge produced and consumed tags over two networks.
Topic Page
Produce and Consume Data 75
Send and Receive Messages 76
Connections 77
Calculate Total Connections 78
Connections Example 79
Controller_2
Controller_3
Controller_4
Consumed Tag
Consumed tag
Consumed Tag
Controller_1
Produced Tag
Tag Type Description
Produced
A produced tag allows other controllers to consume the tag, which means that a controller can receive the tag data
from another controller. The producing controller uses one connection for the produced tag and another for each
consumer. The controller’s communication device uses one connection for each consumer.
As you increase the number of controllers that can consume a produced tag, you also reduce the number of connections
the controller and communication device have available for other operations, like communication and I/O.
Consumed Each consumed tag requires one connection for the controller that is consuming the tag. The controller’s
communication device uses one connection for each consumer.
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