Rockwell Automation Publication 5069-UM004A-EN-P - April 2019 53
Digital Module Operation in a Control System Chapter 1
Local Output Module to Controller Data Transmission
When a local Compact 5000 I/O digital output module receives new data and
the requested data value is present on the RTB, the output module sends, or
‘echoes’, a data value back to the controller and to the rest of the control system.
The data value corresponds to the signal present at its terminals. This feature is
called
Data Echo.
In addition to the Data Echo, the output module sends other data to the
controller at the RPI. For example, the module alerts the controller if a short
circuit condition exists on the module.
The following events occur when a local Compact 5000 I/O digital output
module sends data to the controller at the RPI.
1. The module sends the data to the system backplane.
2. The controller receives the data immediately.
Remote Compact 5000 I/O Digital Output Modules
Remote Compact 5000 I/O digital output modules receive output data from a
controller and send data to the controller. The data exchange occurs over an
EtherNet/IP network.
Controller to Remote Output Module Data Transmission
The controller broadcasts data to its local backplane at one of the following:
•RPI
• An IOT instruction is executed.
IMPORTANT An IOT instruction sends data to all output modules in the system
immediately, and resets the RPI timer.
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