Rockwell Automation RECOMM-ENET EtherNet/IP Communications Module - Manual (Page 62)

6-4 EtherNet/IP Communications Module
For example, an image that uses 32-bit words for Reference and
four Datalinks would change the I/O image in figure 6.1 as follows:
An image that uses a 16-bit Reference and 32-bit Datalinks would
change the I/O image in figure 6.1 as follows:
As another example, figure 6.2 illustrates an I/O image that does
not use all of the I/O data. Only the Logic Command/Reference and
Datalink B are enabled. In this example, the reference is a 32-bit
word, and Datalinks are 16-bit words.
Word Output I/O Word Input I/O
0 Logic Command/Status 0 - 1 Pad Word
1 Pad Word 2 Logic Command/Status
2 - 3 Reference/Feedback 3 Pad Word
4 - 7 Datalink A1/A2 4 - 5 Reference/Feedback
8 - 11 Datalink B1/B2 6 - 9 Datalink A1/A2
12 - 15 Datalink C1/C2 11 - 13 Datalink B1/B2
16 - 19 Datalink D1/D2 14 - 17 Datalink C1/C2
18 - 21 Datalink D1/D2
Word Output I/O Word Input I/O
0 Logic Command/Status 0 - 1 Pad Word
1 Pad Word 2 Logic Command/Status
2 Reference/Feedback 3 Pad Word
3 Pad Word 4 - 5 Reference/Feedback
4 - 7 Datalink A1/A2 6 - 9 Datalink A1/A2
8 - 11 Datalink B1/B2 11 - 13 Datalink B1/B2
12 - 15 Datalink C1/C2 14 - 17 Datalink C1/C2
16 - 19 Datalink D1/D2 18 - 21 Datalink D1/D2