Well, it depends.
There are basically two kinds of EtherNet/IP devices: an I/O Scanner that opens connections and initiates data transfers, and an I/O Adapter that provides data to Scanners. An I/O Adapter device receives implicit communication connection requests from an I/O Scanner then produces its I/O data at the requested rate. An I/O Adapter is also an Explicit Message Server. Scanners also typically support initiating explicit messages (Explicit Message Client). A programmable logic controller (PLC) is an example of an I/O Scanner device. The EtherNet/IP Toolkit for LabVIEW does not provide a means of being the I/O Scanner device, only the I/O Adapter.
There are two kinds of CIP messages that are transferred between scanner and adapter devices: Explicit Messages, which are asynchronous and transferred on an as-needed basis; and Implicit or I/O Messages, which are data messages that are continuously transferred between the devices. Your best bet is to use Explicit Messages to Get and Set the Attributes of interest. I don't have time to check your particular device specs, but this is how I've done it in the past.
You should reference the ODVA Document Library for lots of information about the EtherNet/IP protocol and specifications, including Pub 213, Quick Start for Vendors for an overview of the protocol.
You should also check the examples that ship with the EtherNet/IP Toolkit. Pay particular attention to the "Access Identity Attribute (Explicit).vi", "Write and Read Tag.vi", and "Write Raw Tag & Read Tag.vi" examples.
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"Computers are useless. They can only give you answers." - Pablo Picasso
