18 Rockwell Automation Publication 5000-UM005B-EN-P - November 2015
Chapter 1 Analog I/O Module Operation in a Logix5000 Control System
Controller to Output Module Data Transmission
The controller broadcasts data to its local backplane at one of the following:
• RPI
• An Immediate Output (IOT) instruction is executed.
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.
These events occur when the controller sends data to a 5069 Compact I/O
analog 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, skip to
step 2.
2. The EtherNet/IP communication module transmits the data to the
EtherNet/IP network.
3. After receiving data from the network, the 5069-AEN2TR EtherNet/IP
adapter in the 5069 Compact I/O system receives the data from the
network and transmits it to the 5069 Compact I/O system backplane.
4. The 5069 Compact I/O analog output module receives the data from the
backplane and behaves as dictated by its configuration.
IMPORTANT
An IOT instruction sends data to the output module immediately, and
resets the RPI timer.
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