Rockwell Automation RECOMM-ENET EtherNet/IP Communications Module - Manual (Page 61)

Using I/O Messaging 6-3
Figure 6.1 illustrates an example of an I/O image with 16-bit words.
In figure 6.1, the configuration illustrates using 10 words of output
and 12 words of input (the module adds two pad words at the
beginning of the input). Depending on your application needs, this
may vary.
Figure 6.1 – ControlLogix I/O Image with All I/O Enabled (Example 1)
Controller
EtherNet/IP
Scanner
DPI
Module
Word and I/O
Output
Image
(Write)
Input
Image
(Read)
Message
Handler
0 Logic Command
1 Reference
2 Datalink In A1
3 Datalink In A2
4 Datalink In B1
5 Datalink In B2
6 Datalink In C1
7 Datalink In C2
8 Datalink In D1
9 Datalink In D2
0 Pad Word (1)
1 Pad Word (1)
2 Logic Status
3 Feedback
4 Datalink Out A1
5 Datalink Out A2
6 Datalink Out B1
7 Datalink Out B2
8 Datalink Out C1
9 Datalink Out C2
10 Datalink Out D1
11 Datalink Out D2
Message
Buffer
Message
Handler
Logic Command
Reference
Data In A1
Data In A2
Data In B1
Data In B2
Data In C1
Data In C2
Data In D1
Data In D2
Reliance Electric
Drive
Logic Status
Feedback
Data Out A1
Data Out A2
Data Out B1
Data Out B2
Data Out C1
Data Out C2
Data Out D1
Data Out D2
1 Required by ControlLogix. May or may not be required by other controllers.