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

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