Communicate with the 1791r module, I/o image word/bit definitions – Rockwell Automation 1791R-XXXX CompactBlock RIO User Manual
Page 19
CompactBlock Distributed I/O on Remote I/O 19
Publication 1791R-IN001A-EN-P - February 2002
Communicate With the 1791R Module
Determine the Baud Rate for Your Remote I/O Connection
Use the DIP switches to set the baud rate before you power up the
module.
Refer to the following table for baud rate specifications.
I/O Image Word/Bit Definitions
The smallest portion of a scanners I/O image that can be allocated to
a single RIO device is two logical groups or 1/4 logical rack. A
device’s starting group must begin at even group numbers (0, 2, 4, or
6). See your scanner documentation for further details.
All combinations of 1791R base and expansion modules will fit in the
space allocated by 1/4 logical rack.
I/O images for 1791R base modules follow.
Baud Rate
Cable Length
57.6KBPS
3048m
115.2KBPS
1524m
230.4KBPS
762m
16B0
17
16
15
14
13
12
11
10
7
6
5
4
3
2
1
0
Input
Image
In
15
In
14
In
13
In
12
In
11
In
10
In
9
In
8
In
7
In
6
In
5
In
4
In
3
In
2
In
1
In
0
Input
Image
Reserved
Output
Image
Reserved
Output
Image
Reserved