National Instruments NI-DNET User Manual
Page 51
Appendix A
DeviceNet Overview
A-4
ni.com
Figure A-2. Object Modeling Used in DeviceNet Specification
Every DeviceNet device contains at least one instance (instance one) of the
Identity Object. The Identity Object instance defines attributes which
describe the device, including the device’s vendor, product name, and
serial number. The Identity Object also defines services which apply to the
entire device. For example, if you use the Reset service on instance one of
the Identity Object, the device resets to its power on state.
Another class of object contained in every DeviceNet device is the
Connection Object. Each instance of the Connection Object represents a
communication path to one or more devices. Attributes of each Connection
Object instance include the maximum number of bytes produced on the
connection, the maximum number of bytes consumed, and the expected
rate at which data is transferred.
Application
Object(s)
I/O
Explicit
Messaging
Connection
Objects
DeviceNet Network
Parameter
Object
Identity
Object
Message
Router
Assembly
Object
DeviceNet
Object