1756-6.5.3 - December 1999
A-6 Allocating Communication Connections
The local controller in this example uses these bidirectional connections:
Determining Connections for
Produced and Consumed Tags
The Logix5550 controller supports the ability to produce (broadcast) and
consume (receive) system-shared tags. System-shared data is accessible by
multiple controllers over the ControlBus backplane or over a ControlNet
network. Produced and consumed tags each require connections.
Connections for produced tags
By default, a produced tag allows two other controllers to consume the tag,
which means that as many as two controllers can simultaneously receive the
tag data. The local controller (producing) must have one unidirectional
connection for each consumer and one more unidirectional connection for
the produced tag. The default produced tag requires three unidirectional
connections.
You define the number of consumers through the Tag Properties.
As you increase the number of controllers that can consume a produced tag,
you also reduce the number of connections the controller has available for
other operations, like communications and I/O.
Connection Type Module Quantity Connections
per Module
Total
Connections
Logix5550 controller to local I/O module 2 1 2
Logix5550 controller to remote analog I/O module 1 1 1
Logix5550 controller to remote 1756-CNB module 1 1 1
total
4
specify the maximum number of
consumers for this produced tag
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