Rockwell Automation 1329I DeviceNet Option FRN 1.XXX - Manual (Page 88)

Glossary-4
I 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 1329I unit depend on the input and output assemblies
that you are using.
Idle Action
An idle action determines how the option and connected 1329I unit act
when the processor is placed into an idle mode.
L Logic Command/Status
The logic command/status is used to control and monitor the 1329I unit
(e.g., start, stop, direction). The definition and size of the logic command/
status depends on which assemblies are being used.
M Master/Slave Hierarchy
An 1329I 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.
N 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.
O Objects
An object consists of the attributes (data), services (functions), and behavior
(operations) that are bound together to support a functionality in a device.
P 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 1329I unit.