GN-9212 User Manual
Page 24 of (54)
G-series GN-9212 DeviceNet Rev. 1.01.docx
5.4.2 I/O Process Image Map
An expansion module may have 3 types of data as I/O data, configuration parameter and memory register.
The data exchange between network adapter and expansion modules is done via an I/O process image data
by G-Series Internal Bus protocol. The following figure shows the data flow of process image between
network adapter and expansion modules.
5.4.3. Object Models
A DeviceNet node is modeled as a collection of Objects. An Object provides an abstract representation of a
particular component within a product. The realization of this abstract object model within a product is
implementationdependent. In other words, a product internally maps this object model in a fashion specific
to its implementation.
The objects and their components are addressed by a uniform addressing scheme consisting of:
Media Access Control Identifier (MAC ID), an integer identification value assigned to each node on a
DeviceNet network.
Class Identifier (Class ID), an integer identification value assigned to each Object Class accessible from the
network.
Instance Identifier (Instance ID), an integer identificationvalue assigned to an Object Instance that identifies
it among all Instances of the same Class.
Attribute Identifier (Attribute ID), an integer identificationvalue assigned to a Class and/or Instance Attribute.
Service Code, an integer identificationvalue which denotes a particular Object Instance and/or Object Class
function.
Supported Objects