32 Rockwell Automation Publication 5094-UM001C-EN-P - April 2019
Chapter 1 Digital I/O Module Operation in a Logix 5000 Control System
Connection Over an
EtherNet/IP Network
During module configuration, you must configure the Connection over
EtherNet/IP parameter. The configuration choice dictates how input data is
broadcast over the network.
The FLEX 5000 I/O modules use one of the following methods to broadcast
data:
• Multicast - Data is sent to all network devices
• Unicast - Data is sent to a specific controller depending on the module
configuration
Unicast is the default setting. We recommend that you use Unicast because
it reduces network bandwidth usage.
Input Module Operation
Logix 5000 controllers do not poll the FLEX 5000 input modules for input data.
Instead, the input modules send data at the RPI.
FLEX 5000 input modules reside in a FLEX 5000 I/O system that is accessible
to a Logix 5000 controller over an EtherNet/IP network. A FLEX 5000
EtherNet/IP adapter is the first component in a FLEX 5000 I/O system and
connects the system to the EtherNet/IP network.
FLEX 5000 input modules communicate input data to the FLEX 5000
EtherNet/IP adapter at the defined RPI. The input data consists of point and
status data.
At the RPI, the following events occur.
1. The digital input module scans its points for input data.
2. The module sends the data to the FLEX 5000 EtherNet/IP adapter.
3. The FLEX 5000 EtherNet/IP adapter in the FLEX 5000 I/O system
sends the data over the EtherNet/IP network.
4. One of the following:
• If the controller is directly connected to the EtherNet/IP network, it
receives the input data immediately.
• If the controller is connected to the EtherNet/IP network through
another communication module, the module sends the data to its
backplane and the controller receives it.
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