Rockwell-automation 5720 DriveLogix System Manual de usuario descargar pdf (Pagina 137)

Publication 20D-UM002C-EN-P - November 2003

Communicating with Devices on an EtherNet/IP Link 6-21

Size limit of a produced or consumed tag

A produced or consumed tag can be as large as 488 bytes, but it must also fit

within the bandwidth of the EtherNet/IP network.

Producing a tag

Produced data must be of DINT or REAL data type or a structure. You can

use a user-defined structure to group BOOL, SINT, and INT data to be

produced. To create a produced tag:

1. You must be programming offline.

2. In the controller organizer, double-click the Controller Tags folder and

then click the Edit Tags tab.

3. Select the tag that you want to produce, or enter a new tag, and display

the Tag Properties dialog box.

4. Make sure the tag is controller scope.

5. Select the “Produce this tag” check box. Specify how many controllers

can consume the tag.

You can produce a base, alias, or consumed tag.

The consumed tag in a receiving controller must have the same data type as the

produced tag in the originating controller. The controller performs type

checking to ensure proper data is being received.

Produced tags require connections. The number of connections depends on

how many controllers are consuming the tags. The controller requires one

connection for the produced tag and the first consumer. Then, the controller

requires an additional connection for each subsequent consumer.

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Rockwell-automation 5720 DriveLogix System Manual de usuario Pagina 137