Rockwell-automation Logix5000 Controllers Produced and Consumed Tags P Manuel d'utilisateur télécharger pdf (Page 37)

Produce a Large Array Chapter 2

• Fewer connections are used than if you broke the data into multiple arrays

and sent each as a produced tag. For example, an array with 5000 elements

would take 40 connections (5000/125=40) by using individual arrays.

• Faster transmission times are achieved than if you used a message

instruction to send the entire array.

• Messages are unscheduled and are executed only during the ‘system

overhead’ portion of the Logix5550 execution. Therefore, messages can

take a fairly long time to complete the data transfer.

• You can improve the transfer time by increasing the system overhead

time slice, but this diminishes the performance of the continuous task.

Rockwell Automation Publication 1756-PM011F-EN-P - October 2014 37

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Rockwell-automation Logix5000 Controllers Produced and Consumed Tags P Manuel d'utilisateur Page 37