Rockwell Automation 1791-XXXX Discrete I/O AC and DC Block I/O Input and Output Modules - Manual (Page 62)

Configuring Your Block I/O for PLC
Family Programmable Controllers
Chapter 4
4-5
The SLC 500 controllers communicate with the block I/O using an I/O
Scanner module (cat. no. 1747-SN series A). Refer to the user manual for
the 1747-SN/A Scanner module for more information.
Note: These block I/O modules are not compatible with the 1747-DSN
Distributed I/O Scanner module.
Each block I/O module uses 2 words of output image table memory and 2
words of input image table memory. Each block occupies 1/4 rack of data
table, with 4 blocks comprising 1 logical rack. Image table usage for one
assigned rack number and examples of image table usage are shown in
Figures 4.2 through 4.10.
Figure 4.2
I/O Image Table for One Assigned Rack Number with 16Ćpoint Modules
Output Image
Input Image
Reserved
Reserved
0
1
2
3
4
5
6
7
Reserved
Reserved
Reserved
0 17
Reserved
Reserved
Reserved
Reserved
0
1
2
3
4
5
6
7
Reserved
Reserved
Reserved
7 10
1 I/O Rack
1791Ć16A0 1791Ć8AC 1791Ć16B0 1791Ć0B16
PLC
SLC 0 7 8 15
SLC 0 7 8 15
0 17 7 10 PLC
Reserved