Rockwell Automation 1769-SM1 Compact I/O to DPI/SCANport Module - Manual (Page 163)

Glossary
C
CIP (Common Industrial Protocol)
CIP is the transport and application layer protocol used for messaging
over DeviceNet. The protocol is for implicit messaging (real-time I/O)
and explicit messaging (configuration, data collection, and diagnostics).
Classes
A class is defined by the DeviceNet specification as “a set of objects that
all represent the same kind of system component. A class is a
generalization of an object. All objects in a class are identical in form
and behavior, but may contain different attribute values.”
Controller
A controller, also called programmable logic controller, is a solid-state
control system that has a user-programmable memory for storage of
instructions to implement specific functions such as I/O control, logic,
timing, counting, report generation, communication, arithmetic, and data
file manipulation. A controller consists of a central processor, input/
output interface, and memory. See also Scanner.
D
Data Rate
The data rate is the speed at which data is transferred on the DeviceNet
network. The available data rates depend on the type of cable and total
cable length used on the network:
Each device on a DeviceNet network must be set for the same data rate.
You can set the DeviceNet module to 125 K, 250 K, or 500 K. You can
set it to Autobaud if another device on the network has set the data rate.
Datalinks
A Datalink is a type of pointer used by some PowerFlex drives to
transfer data to and from the controller. Datalinks allow specified
parameter value(s) to be accessed or changed without using explicit
messages. When enabled, each Datalink consumes either four bytes or
eight bytes in both the input and output image table of the controller. The
drive determines the size of Datalinks.
Maximum Cable Length
Cable 125 K 250 K 500 K
Thick Trunk Line 500 m (1,640 ft.) 250 m (820 ft.) 100 m (328 ft.)
Thin Trunk Line 100 m (328 ft.) 100 m (328 ft.) 100 m (328 ft.)
Maximum Drop Length 6 m (20 ft.) 6 m (20 ft.) 6 m (20 ft.)
Cumulative Drop Length 156 m (512 ft.) 78 m (256 ft.) 39 m (128 ft.)