Rockwell Automation 1788-EN2PAR EtherNet/IP and ControlNet to PROFIBUS PA Linking Device User Manual - Manual (Page 28)

28 Rockwell Automation Publication 1788-UM058B-EN-P - September 2014
Chapter 2 Set Up in the Studio 5000 Logix Designer Application
Add the 1788-CN2PAR
Linking Device to the I/O Tree The 1788-CN2PAR linking device must be added to the I/O tree of the Logix
controller. The linking device must be added to a ControlNet bridge module,
such as an Allen-Bradley 1756-CNB or 1756-CNBR module.
Follow these steps to add the linking device to the I/O tree of the Logix
controller. This example uses the 1756-CNBR module.
1. Right-click the ControlNet bridge and choose New Module.
2. Select the linking device to add to the ControlNet bridge.
3. Click the General tab and set the name, description, and ControlNet node
address.
4. Set the RPI for the linking device.
The linking device RPI defaults to 300 ms. You can change the RPI if
needed, depending on field device count and required update times.
5. Click OK to add the linking device to the I/O tree.
IMPORTANT The RPI determines the number of Class 1 data requests sent for the field
devices that are configured on the PA bus. If many field devices are
configured on the bus and RPI is set too low, class 1 data (PVs and
status) do not update each cycle, and class 2 data responses are slowed.
See Class 2 MPPF on page 31 in the master configuration.