Rockwell Automation Logix5000 Controllers Produced and Consumed Tags Programming Manual - Manual (Page 12)

Chapter 1 Produce and Consume a Tag
Adjustment Description
Reduce your NUT. At a faster NUT, less connections have to share an update slot.
Increase the requested packet interval (RPI) of your
connections. At higher RPIs, connections can take turns sending data during an update slot.
For a ControlNet bridge module (CNB) in a remote chassis,
choose the most efficient communication format for that
chassis: Are most of the modules in the chassis
non-diagnostic, digital I/O modules? Then choose this communication format for the
remote CNB module.
Yes Rack Optimization
No None
The Rack Optimization format uses an additional 8 bytes for each slot in its chassis. Analog modules or modules that are
sending or getting diagnostic, fuse, timestamp, or schedule data require direct connections and cannot take advantage
of the rack optimized form. Choosing None frees up the 8 bytes per slot for other uses, such as produced or consumed
tags.
Separate the tag into two or more smaller tags. 1. Group the data according to similar update rates. For example, you could create one tag for data that is critical and
another tag for data that is not as critical.
2. Assign a different RPI to each tag.
Create logic to transfer the data in smaller sections
(packets).
See Produce a large array on page 36.
Follow these steps to create a producer tag.
1. Open the Logix Designer application and choose a controller.
Important: A controller can have both producing and consuming tags, but a producer cannot consume its
own data. The local controller is the consumer, and the remote controller is the producer.
2. In the Controller Organizer, right-click the Controller Tags folder and
click Edit Tags.
You can produce only controller-scoped tags.
3. In the Tags Editor, right-click the tag that you want to be a producer, and
choose Edit (name of tag) Properties.
Produce a tag
12 Rockwell Automation Publication 1756-PM011F-EN-P - October 2014