Rockwell Automation Publication 5000-UM005B-EN-P - November 2015 19
Analog I/O Module Operation in a Logix5000 Control System Chapter 1
Output Module to Controller Data Transmission
When an 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 5069 Compact I/O analog output module
sends data to the controller at the RPI.
1. The module sends the data to the 5069 Compact I/O system backplane.
2. The 5069-AEN2TR 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 owner-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 owner-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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