Rockwell Automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User Manual - Manual (Page 17)

1–5 Overview of FLEX I/O and Your PROFIBUS Adapter Module
Publication 1794ĆUM057B-EN-P - November 2001
The 1794-APB is a FLEX I/O adapter that interacts with the FLEX
I/O backplane and any PROFIBUS DP master/scanner controller on
a PROFIBUS DP network.
The 1794-APB module is a slave device to the DP master/scanner,
and is a master controller of the FLEX I/O system where it is
installed.
The I/O data exchange occurs as follows: Output data is sent from
the DP master/scanner controller across the PROFIBUS DP network
to the 1794-APB adapter. The adapter then automatically transfers
the data across the FLEX I/O backplane to the output modules.
Inputs from the input modules are collected by the FLEX I/O adapter
via the backplane and sent across the PROFIBUS DP network to the
DP master/scanner controller.
Other DP
Adapter/Slave
Other DP
Adapter/Slave
PROFIBUS DP
Master/Scanner
Controller
= T-junction
= Termination Block
= Bus Segment
= Drop Cable
Personal Computer
with Configuration
Software
1794ĆAPB Adapter Slave
FLEX I/O System
RSĆ232
DP
Purpose of the 1794ĆAPB
FLEX I/O Adapter