Rockwell Automation MD65 EtherNet/IP Communication Module - Manual (Page 172)

Glossary-6 EtherNet/IP Communications Module
UDP (User Datagram Protocol) - EtherNet/IP uses this protocol to
transfer I/O packets using IP. UDP provides a simple, but fast
capability to send I/O messaging packets between devices. This
protocol ensures that modules transmit the most recent data
because it does not use acknowledgements or retries.
VS Utilities software - A software tool for monitoring and
configuring Reliance Electric products and modules. VS Utilities can
be used to configure the EtherNet/IP module and MD65 drives.
zero data - When communications are disrupted (for example, a
cable is disconnected), the module and drive can respond with zero
data. Zero data results in the drive receiving zero as values for
command data. If the drive was running and using the reference
from the module, it will stay running but at zero reference.