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The physical port of each DeviceNet card is listed under the card’s name. 
To configure software properties, right-click the port and select 
Properties.

In the Properties dialog, you assign an interface name to the port, such as 
DNET0 or DNET1. The interface name identifies the physical port within 
NI-DNET APIs.

To change the default protocol for the DeviceNet (CAN) card, right-click 
the card and select Protocol. In this dialog you can select either DeviceNet 
for NI-DNET (default), or CAN for NI-CAN. For more information, refer 
to the section 

LabVIEW Real-Time (RT) combines easy-to-use LabVIEW programming 
with the power of real-time systems. When you use a National Instruments 
PXI controller as a LabVIEW RT system, you can install a PXI DeviceNet 
card and use the NI-DNET APIs to develop real-time applications. For 
example, you can control a network of DeviceNet devices as a master, and 
write your control algorithm in LabVIEW.

When you install the NI-DNET software, the installer checks for the 
presence of the LabVIEW RT module. If LabVIEW RT exists, the 
NI-DNET installer copies components for LabVIEW RT to your 
Windows system. As with any other NI product for LabVIEW RT, you then 
download the NI-DNET and NI-CAN software to your LabVIEW RT 
system using the Remote Systems branch in MAX. For more information, 
refer to the LabVIEW RT documentation.

After you have installed your PXI DeviceNet cards and downloaded the 
NI-DNET software to your LabVIEW RT system, you need to verify 
the installation. Within the Tools menu in MAX, select NI-DNET»
RT Hardware Configuration. The RT Hardware Configuration tool 
provides features similar to Devices & Interfaces on your local system. 
Use the RT Hardware Configuration tool to self-test the DeviceNet cards 
and assign an interface name to each physical DeviceNet port.

NI-DNET provides tools that you can launch from MAX.