Chapter 1
Produce and Consume a Tag
12
Rockwell Automation Publication 1756-PM011J-EN-P - February 2018
For two controllers to share produced or consumed tags, both controllers
must be in the same backplane or attached to the same control network,
such as ControlNet or EtherNet/IP network. Although produced and
consumed tags can be bridged over two networks, Rockwell Automation®
does not support this configuration. Check the documentation specific to
your controller to determine which network connections it supports.
Produced and consumed tags each require connections. As the number of
controllers that can consume a produced tag increases, the number of
connections the controller has available for other operations, like
communication and I/O, is reduced.
Important:
If a consumed-tag connection fails, all of the other tags being consumed
from that remote controller stop receiving new data.
Each produced or consumed tag uses the following connections.
This Type of Tag
Uses This Many Connections
Produced tag
number_of_con 1
Consumed tag
1
Example:
Connection Requirements of a Produced or Consumed Tag
•
A ControlLogix controller producing 4 tags for 1 controller uses 8
connections:
•
Each tag uses 2 connections (1 co 1 = 2).
•
2 connections per tag x 4 tags = 8 connections.
•
Consuming 4 tags from a controller uses 4 connections (1 connection
per tag x 4 tags = 4 connections).
Communication Paths to Compact GuardLogix 5380, CompactLogix
5380, CompactLogix 5480, ControlLogix 5580, and GuardLogix 5580
controllers
If a controller running release v24 or earlier is to consume tag data from
Compact GuardLogix 5380, CompactLogix 5380, CompactLogix 5480,
ControlLogix 5580, or GuardLogix 5580 controller, it must have a target
device in its I/O configuration for the connection. However, releases v24 and
earlier do not have profiles for Compact GuardLogix 5380, CompactLogix
5380, CompactLogix 5480, ControlLogix 5580, and GuardLogix 5580
controllers, so a substitute must be used.
Rockwell recommends the following substitutes:
•
To consume tags through the embedded Ethernet port on Compact
GuardLogix 5380, CompactLogix 5380, CompactLogix 5480,
ControlLogix 5580, or GuardLogix 5580 controller, represent the
controller as a CompactLogix 5370 Controller, such as the 1769-
Controllers and
networks that
support
produced/consumed
tags
Connection
requirements of a
produced or
consumed tag
