Rockwell Automation Publication 1715-RM001A-EN-P - June 2019
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Using 1715 Hardware in a ControlLogix SIL 2 System
Chapter 4
Input Data System
Input modules send data only one way; from the input module to the controller.
Output Data System
Output modules send data both ways. Status is sent from the module to the
controller and the controller send output requests to the module.
