16 Rockwell Automation Publication 1756-UM540E-EN-P - December 2017
Chapter 1 Analog I/O Module Operation in the ControlLogix System
At the RPI, the following events occur.
1. The module scans its channels for input data.
2. The module broadcasts the data to its backplane.
The input module broadcasts data to the chassis backplane immediately after
the scan:
• When the module resides in the local chassis, the controller receives the
data immediately.
• When the module resides in a remote chassis, the time that elapses before
the controller receives the data depends on the network configuration that
connects the local and remote chassis.
For more information, see Input Modules in a Remote Chassis.
Input Modules in a Local Chassis
When an input module resides in a local chassis (see Configure a Module on
page 13) and after the input module broadcasts data to the chassis backplane, the
controller receives it immediately. The analog input module broadcasts data
using Multicast as its connection method in a local chassis.
On-Board Memory
Status Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Ch 0
Ch 1
Ch 2
Ch 3
Ch 4
Ch 5
Timestamp
1
2
Channel Data
Channel Data Ch 6
Ch 7
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