Allen-Bradley 1794-IE8H, User Manual, Page: 63 / 146

Publication 1794-UM063A-EN-P - March 2006
Input, Output and Configuration Files for the Analog I/O Modules on the ControlNet Network 4-3
Communication Over the
FLEX I/O Backplane
One 1794-ACNR15/B ControlNet adapter can interface 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 (typically
one or more controllers, scanners, or programming terminals) over the
ControlNet network. The adapter communicates with its I/O modules over
the FLEX I/O backplane.
Configuration data is not continuously updated to the module.
Scheduled Data Transfer
Scheduled data transfer:
•
is continuous.
•
is asynchronous to the controller program scan.
•
occurs at the actual rate displayed in the Actual Packet Interval field on
the programming software ControlNet I/O mapping (monitor) screen.
I/O Module I/O Module I/O Module
Configuration Configuration Configuration
Inputs Inputs Inputs
Status
Outputs
Status Status
Outputs Outputs
Read
Words
Write
Words
0
X
Slot 0 Slot 1 Slot 7
Network
ControlNet
Adapter
Read
Write
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