Rockwell Automation 1756-IF4FXOF2F ControlLogix High-speed Analog I/O Module - Manual (Page 105)

Rockwell Automation Publication 1756-UM005B-EN-P - January 2013 105
Data Storage Appendix A
2. Enter the RPI and RTS values for your application.
Be aware that as these values decrease, the Event task executes more
frequently, and the module sends data to the controller at a faster rate. This
places more demand on controller resources. For example, an RTS of 4 ms
causes the Event task to trigger every 4 ms. If the amount of code the Event
task executes is too great, the controller does not have enough available
resources to execute other tasks, or the Event task can experience task
overlaps. In typical applications with a 1756-L7
x controller, an RTS of
4 ms leaves sufficient resources for other tasks.