Rockwell Automation Publication 1756-UM540E-EN-P - December 2017 17
Analog I/O Module Operation in the ControlLogix System Chapter 1
Input Modules in a Remote Chassis
When an input module resides in a remote chassis (see Configure a Module on
page 13), it is considered remote input module.
At the RPI, the following events occur.
1. The remote input module scans its channels for input data.
2. The remote input module broadcasts the data to its backplane.
3. The network communication module in the chassis with the I/O module
sends the data over the network to the controller.
Broadcast Method
The analog input module broadcasts data by using one of the following
connection methods:
• Multicast - Data is sent to all network devices at once
• Unicast - Data is sent to a specific controller depending on the
configuration of the module
For more information on guidelines for specifying RPI rates, see the Logix5000™
Controllers Design Considerations Reference Manual, publication
1756-RM094
.
Trigger Event Tasks
ControlLogix analog input modules can trigger an Event task. The Event task
causes the controller to execute a section of logic immediately when a triggering
event occurs. You can configure the Event task to be triggered if new input data is
sent at the RPI.
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