Rockwell Automation 1329I DeviceNet Option FRN 1.XXX - Manual (Page 89)

Glossary-5
Producer/Consumer Network
DeviceNet is a producer/consumer network. On producer/consumer
networks, packets are identified by content rather than by an explicit
destination. If a node needs the packet, it will accept the identifier and
consume the packet. The source therefore sends a packet once and all the
nodes consume the same packet if they need it. Data is therefore produced
once, regardless of the number of consumers. Also, precise synchronization
is possible because data arrives at each node at the same time
R Reference/Feedback
The reference/feedback is used to send a reference (i.e., command speed) to
the 1329I unit and monitor its feedback (i.e. actual speed). The size and
definition of the reference/feedback depend on the assemblies that you are
using.
RSNetWorx for DeviceNet Software
RSNetWorx for DeviceNet software is tool for configuring and monitoring
DeviceNet networks and connected devices. It is a 32-bit Windows
application that runs on Windows 95, Windows 98, and Windows NT.
Information about RSNetWorx for DeviceNet software can be found at
http://www.software.rockwell.com/rsnetworx.
S Scanner
A scanner is a separate module (of a multi-module controller) or a built-in
component (of a single-module controller) that provides communication
with options connected to a network. See also Controller
U UCMM (UnConnected Message Manager)
UCMM is the use of explicit messages that use the DeviceNet group 3
identifiers. They allow multiple devices to access the 1329I unit and
DeviceNet option at the same time.
Z Zero Data
When communications are disrupted (e.g., a cable is disconnected), the
DeviceNet option and 1329I unit can respond with zero data. Zero data
results in the 1329I unit receiving zero as values for logic command and
speed reference. This will stop the unit.