Rockwell Automation 5720 DriveLogix System - Manual (Page 166)

Publication 20D-UM002C-EN-P - November 2003
7-20 Communicating with Devices on a ControlNet Link
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.
Consuming a tag
A consumed tag represents data that is produced (broadcast) by one controller
and received and stored by the consuming controller. To create a consumed
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 consume, or enter a new tag, and display
the Tag Properties dialog box.
4. Specify:
All consumed tags are automatically controller-scope.
In this field: Type or select:
Tag Type Select Consumed.
Controller Select the name of the other controller. You must have already created the controller in
the controller organizer for the controller name to be available.
Remote Tag Name
Remote Instance Type a name for the tag in the other controller you want to consume.
Important: The name must match the name in the remote controller exactly, or the
connection faults.
If the remote controller is a ControlNet PLC-5, this field is Remote Instance. Select the
instance number (1-128) of the data on the remote controller.
RPI
(requested packet interval) Type the amount of time in msec between updates of the data from the remote controller.
The local controller will receive data at least this fast.
Display Style If you are creating a consumed tag that refers to a tag whose data type is BOOL, SINT,
INT, DINT, or REAL, you can select a display style. This display style defines how the tag
value will be displayed in the data monitor and ladder editor. The display style does not
have to match the display style of the tag in the remote controller.