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Chapter 4 Control I/O
Set Up the Hardware
In this example, the Logix5000 controller uses a ControlNet communication
module in the local chassis to connect to the ControlNet network. The
distributed (remote) I/O has a ControlNet adapter to connect it to the
ControlNet network.
Figure 10 - Overview of ControlNet I/O Distribution
Local Chassis (Logix5000
Controller with ControlNet
communication module)
Distributed I/O
(ControlNet adapter
with I/O modules)
Make sure of the following:
•
•
All wiring and cabling are properly connected.
The communication driver is configured for the programming
workstation.
Requested Packet Interval
(RPI)
When you configure an I/O module, you define the RPI for the module. The
RPI specifies the interval at which data updates over a connection. For example,
an input module sends data to a controller at the RPI that you assign to the
module. Configure the RPI in milliseconds.
RPI is used only for a module that produces or consumes data. For example, a
local ControlNet communication module does not require an RPI because it is
not a data-producing member of the system, but only a bridge.
In Logix5000 controllers, I/O values update at an interval that you configure via
the I/O configuration folder of the project. The values update asynchronously to
the execution of logic. At the specified interval, the controller updates a value
independently from the execution of logic.
56 Rockwell Automation Publication CNET- UM001E-EN-P - June 2016
Logix5575 ControlNet EtherNet/IP ControlNet
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