Rockwell Automation 1769-ASCII Compact I/O ASCII Module - Manual (Page 44)

44 Rockwell Automation Publication 1769-UM012B-EN-P - January 2014
Chapter 2 Configure the 1769-ASCII Module
Input Channel1
The Input Channel1 does the following tasks:
• On first scan, store current value of Rx1 Transaction ID (channel 1) as
‘most recent’
• When the Rx Transaction ID changes, it indicates there is ‘new data.’
• Copies data from the module's Input Tags to a STRING tag
(InData1) if CNI = 1.
• Indicates to the MainRoutine that new data has arrived. Saves this value of
Rx Transaction ID, so you can detect the next change.