Rockwell Automation Publication 5069-UM004A-EN-P - April 2019 55
Digital Module Operation in a Control System Chapter 1
Remote Output Module to Controller Data Transmission
When a 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 remote 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 Compact 5000 I/O EtherNet/IP adapter in the 5069 Compact
I/O system sends the data over the EtherNet/IP network.
3. One of the following:
• If the controller is directly connected to the EtherNet/IP network, it
receives the input data from the network without need for a
communication module.
• If the controller is connected to the EtherNet/IP network through
another communication module, the module transmits the data to its
backplane and the controller receives it.
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