Rockwell Automation Logix5000 Controllers Tasks, Programs, and Routines Programming Manual - Manual (Page 37)

Manage event tasks Chapter 2
To trigger an event task based on data from an input module, use the Module
Input Data State Change trigger.
Let an event trigger this task.
Let data from an input module trigger the task.
Let this input tag trigger the task.
When the task is done, do not update digital outputs in the local chassis.
How an I/O module triggers an event task
The following terms apply to the operation of an input module.
Term Definition
Multicast A mechanism where a module sends data on a network that is simultaneously received by
more than one listener (device). Describes the feature of the Logix5000 I/O line that supports
multiple controllers receiving input data from the same I/O module at the same time.
Requested packet interval
(RPI)
The RPI specifies the interval that a module multicasts its data. For example, an input
module sends data to a controller at the RPI that you assign to the module.
•
The range is 0.2…750 ms.
• When the specified time frame elapses, the module multicasts its data. This is also called
a cyclic update.
Real time sample (RTS) The RTS specifies when an analog module scans its channels and multicasts the data (update
the input data buffer then multicast).
Module Input Data State
Change trigger
Rockwell Automation Publication 1756-PM005-EN-P - October 2014 37