Specifications

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1768-SG001A-EN-P -- March 2006
CompactLogix Selection Guide
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The controller supports the ability to produce (broadcast) and consume (receive) system-
shared tags over EtherNet/IP networks. Produced and consumed tags each require
connections.
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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 local controller (producing) uses one connection for
the produced tag and one connection 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 communications 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.
For two controllers to share produced or consumed tags, both controllers must be attached
to the same Ethernet/IP network. You cannot bridge produced and consumed tags over
two networks.
The total number of tags that can be produced or consumed is limited by the number of
available connections in the 1768-ENBT module.
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Messages transfer data to other devices, such as other controllers or operator interfaces.
Some messages use unscheduled connections to send or receive data. These connected
messages can leave the connection open (cache) or close the connection when the
message is done transmitting.
Each message uses one connection, regardless of how many devices are in the message
path. To conserve connections, you can configure one message to read from or write to
multiple devices.