Determining Connections For Produced And Consumed Tags; Connections For Produced Tags - Allen-Bradley ControlLogix User Manual

A-6 Allocating Communication Connections
Connection Type
Logix5550 controller to local I/O module
Logix5550 controller to remote analog I/O module
Logix5550 controller to remote 1756-CNB module
Determining Connections for
Produced and Consumed Tags
1756-6.5.3 - December 1999
The local controller in this example uses these bidirectional connections:
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.
specify the maximum number of
consumers for this produced tag
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.
Module Quantity Connections
per Module
2 1
1 1
1 1
Total
Connections
2
1
1
total
4