9.8 CIP Object
9.8.1 Object List
CIP requires objects (groups of related data and behaviors associated with this data) to describe a device, how it
functions, communicates, and to define its unique identity. Objects can be further defined by Class (a set of objects
representing the same type of system), Instance (a copy of an object), and Attribute (data values). An object’s instance
and class have attributes, providing services and implementing behaviors. Instance 0 contains the basic information for
every object, that is: version and length. Instance 1–N contains parameters for creating connections. You can get product
parameters from the supported service code through objects.
You can use API 2208 EIPRW instruction or explicit messages to read / write objects. The supported EtherNet/IP objects
are listed in the following table. Refer to Section 9.8.2 for the data type definitions. Refer to Section 9.8.3 ~ 9.8.19 for
object contents.
Object Name Function Class ID
Identity Object Provides identification of general information about the device. 1 (H’01)
Message Router Object
Provides a messaging connection point through which a client
can address a service to any object class or instance residing in
the physical device.
2 (H’02)
Assembly Object
Binds attributes of multiple objects, which allows data to or from
each object to be sent or received over a single connection and
can be used to bind input data or output data.
4 (H’04)
Connection Manager
Object
Provides connection and connectionless communications,
including establishing connections across multiple subnets.
6 (H’06)
Port Object
Describes the communication interfaces that are present on the
device and visible to CIP, including USB, Ethernet/IP and more.
244 (H’F4)
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