Rockwell Automation VSM500 Integrated Drive/Motor DeviceNet Option Board - Manual (Page 95)

Glossary D-3
Electronic Data Sheet (EDS) Files: EDS files are simple text files that are used by
network configuration tools, such as DeviceNet Manager and RSNetWorx for
DeviceNet, to help you identify products such as VSM500 units and easily commission
them on a network. EDS files describe a product device type, revision, and
configurable parameters.
Explicit Messaging: Explicit messages are used to configure, monitor, and diagnose
devices.
Fault Action: A fault action determines how the option and connected VSM500 unit
act when there is a communications fault (e.g., a cable is disconnected).
Faulted Node Recovery: If you have software that supports this feature, you can
change a configuration of a device that is faulted on the network. For example, if you
add a device to a network and it does not have a unique address, it will fault. If it has
faulted node recovery, you can change its node address so that it is no longer faulted.
Hold Last State: When communications are disrupted (e.g., a cable is disconnected),
the DeviceNet option board and VSM500 unit can respond by holding last state. Hold
last state results in the VSM500 unit receiving the last data received via the DeviceNet
connection before the disruption. If the VSM500 unit was in RUN mode and using the
reference from DeviceNet, it will continue to run at the same reference.
I/O Messaging: I/O messages are used to transmit time-critical I/O data that controls
the drive. I/O messages are sometimes referred to as implicit messages. The I/O
messages used for the VSM500 unit depend on the input and output assemblies that
you are using.
Idle Action: An idle action determines how the option and connected VSM500 unit
act when the processor is placed into an idle mode.
Logic Command/Status: The logic command/status is used to control and monitor
the VSM500 unit (e.g., start, stop, direction). The definition and size of the logic
command/status depends on which assemblies are being used.
Master/Slave Hierarchy: An VSM500 unit configured for a master-slave hierarchy
exchanges data with the master device (scanner). Usually, a network has one scanner
which is the master device, and all other devices are slave devices. A network can
have multiple scanners. These networks are sometimes referred to as “multimaster
hierarchies.” On such networks, each slave device must have a scanner specified as
its master.
Node Address: A DeviceNet network can have as many as 64 devices connected to
it. Each device on the network must have a unique node address between 0 and 63.
However, some node addresses are reserved for special devices. For example, node
number 0 is usually reserved for scanners. Node number 62 is usually reserved for a
computer connected to the network. Node number 63 is always reserved for new
devices.
Object: An object consists of the attributes (data), services (functions), and behavior
(operations) that are bound together to support a functionality in a device.
Polled I/O Data Exchange: A device that is configured for polled I/O data exchange
sends data immediately after it receives data. For example, an option receives a logic
status command from the scanner and then sends the logic status of connected
VSM500 unit.