Rockwell-automation 5720 DriveLogix System Instrukcja Użytkownika Pobierz pdf (Strona 165)

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

Communicating with Devices on a ControlNet Link 7-19

• For a ControlNet bridge module (CNB) in a remote chassis, select the

most efficient communication format for that chassis:.

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, or timestamp data require direct connections and

cannot take advantage of the rack optimized form. Selecting “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:

– 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.

– Assign a different RPI to each tag.

• Create logic to transfer the data in smaller sections (packets).

Producing a tag

Produced data must be of DINT or REAL data type or an array or 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.

Are most of the modules in the

chassis non-diagnostic, digital

I/O modules?

Then select this communication

format for the remote

communication module:

yes rack optimization

no none

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Rockwell-automation 5720 DriveLogix System Instrukcja Użytkownika Strona 165