Rockwell-automation Logix5000 Controllers Produced and Consumed Tags P Manuel d'utilisateur télécharger pdf (Page 34)

Chapter 2 Produce a Large Array

When the offset value in array_ack[0] is equal to the current offset value, the consumer has copied the packet to the array; so the rung checks for more data to transfer. If the offset value

plus 123 is less than the size of the array, there is more data to transfer; so the rung increases the offset by 123. Otherwise, there is no more data to transfer; so the rung resets the offset

value, logs the transfer time, and resets the timer. In either case, the rung uses the new offset value to create a new packet of data, appends the new offset value to the packet, and clears

the acknowledge element of the packet (packet[124]).

If the current transfer time is greater than the maximum transfer time, update the maximum transfer time. This maintains a record of the longest time to transfer data.

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

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