Rockwell Automation 20-COMM-R Remote I/O Adapter - Manual (Page 39)

Using Discrete and Block Transfer I/O 4-3
20-COMM-R Remote I/O Adapter User Manual
Publication 20COMM-UM004D-EN-P
Figure 4.2 Example I/O Image Using 1/2 Rack Configuration
(1) Not used in 1/2 rack. The space is reserved so the Datalinks occupy the same Block Transfer I/O locations
regardless of 1/4 rack or 1/2 rack configuration.
(2) Feedback is transmitted in both Discrete I/O and Block Transfer I/O.
Controller Scanner Adapter PowerFlex Drive
Remote I/O DPI
Output
Image
Data
Files
Block Transfer Messages
Message
Handler
Discrete I/O
Block Transfer I/O
0 - 1 Feedback
2 - 3 Datalink A1
4 - 5 Datalink A2
6 - 7 Datalink B1
8 - 9 Datalink B2
10 - 11 Datalink C1
12 - 13 Datalink C2
14 - 15 Datalink D1
16 - 17 Datalink D2
Discrete I/O
Block Transfer I/O
Wo
rd
0 - 1 Reference
2 - 3 Datalink A1
4 - 5 Datalink A2
6 - 7 Datalink B1
8 - 9 Datalink B2
10 - 11 Datalink C1
12 - 13 Datalink C2
14 - 15 Datalink D1
16 - 17 Datalink D2
Wo
rd
Wo
rd
0 BT Control
1 Logic Command
2 - 3 Reference
Wo
rd
Data
Files
Input
Image
Data
Files
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
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
0 BT Status
1 Logic Status
2 - 3 Feedback
(1)
(2)