Rockwell-automation Logix5000 Controllers Produced and Consumed Tags P Manual de usuario descargar pdf (Pagina 10)

Chapter 1 Produce and Consume a Tag

This controller Can produce and consume tags over this network

Backplane ControlNet EtherNet/IP

1768 CompactLogix

ControlLogix

X X X

DriveLogix

X X

SoftLogix5800

X X X

For two controllers to share produced or consumed tags, both controllers must be

attached to the same network, such as a ControlNet or Ethernet/IP network. You

cannot bridge produced and consumed tags over two networks.

Produced and consumed tags each require connections. 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

communication and I/O.

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_consumers + 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 consumer + 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).

As you organize your tags for produced or consumed data (shared data), follow

these guidelines.

Guideline Details

Create the tags at the controller scope. You can share only controller-scoped tags.

Use one of these data types:

• DINT

• REAL

• Array of DINTs or REALs

• User-defined

To share other data types, create a user-defined data type that contains the required data.

Connection requirements of

a produced or consumed

tag

Organize tags for produced

or consumed data

10 Rockwell Automation Publication 1756-PM011F-EN-P - October 2014

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