Set Up The Hardware; Set A Requested Packet Interval - Rockwell Automation Allen-Bradley ControlNet 1734-ACNR User Manual

4-2 Control I/O

Set Up the Hardware

Local Chassis
Logix5000 Controller
With ControlNet
Communication Module
Set a Requested
Packet Interval
Publication CNET-UM001C-EN-P - November 2005
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.
Data
Make sure:
• all wiring and cabling is properly connected.
• the communication driver (such as, AB-PCICS-1) is configured for the
programming workstation.
When you configure an I/O module, you define the RPI for the module. The
RPI specifies the period 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.
RPIs are only used for modules that produce or consume data. For example a
local ControlNet communication module does not require an RPI because it is
not a data-producing member of the system; it is used only as a bridge.
In Logix5000 controllers, I/O values update at a period 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.
Distributed I/O
ControlNet Adapter
With I/O Modules
Programming
Terminal
43611