Rockwell Automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual - Manual (Page 21)

Chapter
2
Communicate With Your Module
Overview Read this chapter to familiarize yourself with configurable features on the input
and output analog modules
Communication Over the
I/O Backplane One 1794-APBDPV1 PROFIBUS adapter can interface with up to eight
terminal base units with installed FLEX I/O modules, forming a FLEX I/O
system of up to eight slots. The adapter communicates to other network system
components over the PROFIBUS network. The adapter communicates with its
I/O modules over the backplane.
The I/O map for a module is divided into read words and write words. Read
words consist of input and status words, and write words consist of output and
configuration words. The number of read words or write words can be 0 or more.
The length of each I/O module’s read words and write words vary in size
depending on module complexity. Each I/O module will support at least 1 input
word or 1 output word. Status and configuration are optional, depending on
the module.
For Information About See Page
Communication Over the I/O Backplane 9
Polled I/O Structure 10
Map Data into the Image Table 12
Defaults 68
PROFIBUS
Adapter
Read
Read
Words
Inputs
Status
Outputs
Configuration
Inputs
Status
Outputs
Configuration
Inputs
Status
Outputs
Configuration
Write
Words
15
0
Write
1122