54 Rockwell Automation Publication 5069-UM004A-EN-P - April 2019
Chapter 1 Digital Module Operation in a Control System
Based on the RPI rate and the length of the controller program scan, the
output module can receive and echo data multiple times during one program
scan.
When the RPI is less than the program scan length, the output channels can
change values multiple times during a program scan. The owner-controller
does not depend on the program scan to complete to send data.
The following events occur when the controller sends data to a Compact 5000
I/O digital output module.
1. Data is sent in one of the following ways:
• If the controller is directly connected to the EtherNet/IP network, it
broadcasts data to the network.
In this case, skip to
step 3.
• If the controller is connected to the EtherNet/IP network via a
communication module, the controller transmits the data to the
backplane.
In this case, proceed to
step 2.
2. The EtherNet/IP communication module transmits the data to the
EtherNet/IP network.
3. The Compact 5000 I/O EtherNet/IP adapter in the remote Compact
5000 I/O system receives the data from the network and transmits it to
the system backplane.
4. The remote output module receives the data from the backplane and
behaves as dictated by its configuration.
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