Glossary G-7
PowerFlex® 755 Drive Embedded EtherNet/IP Adapter User Manual
Publication 750COM-UM001A-EN-P
mask indicates that 26 bits are used to identify the network and 6 bits
are used to identify devices on each network. Instead of a single
physical Class C network with 254 devices, this subnet mask divides it
into four networks with up to 62 devices each.
Switches
Network devices that provide virtual connections that help to control
collisions and reduce traffic on the network. They are able to reduce
network congestion by transmitting packets to an individual port only if
they are destined for the connected device. In a control application, in
which real time data access is critical, network switches may be
required in place of hubs.
T TCP (Transmission Control Protocol)
EtherNet/IP uses this protocol to transfer Explicit Messaging packets
using IP. TCP guarantees delivery of data through the use of retries.
U 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 adapters transmit the most
recent data because it does not use acknowledgements or retries.
UDDT (User-Defined Data Type)
A structure data type that you define during the development of an
application (for example, to convert 32-bit REAL parameter data to
correctly write and read their values).
Z Zero Data
When communications are disrupted (for example, a cable is
disconnected), the adapter and drive can respond with zero data. Zero
data results in the drive receiving zero as values for Logic Command,
Reference, and Datalink data. If the drive was running and using the
Reference from the adapter, it will stay running but at zero Reference.
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