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Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 517
CIP Objects Appendix A
Assembly Object The Assembly Object (class code 0x04) binds attributes of multiple objects,
which allows data to or from each object to be sent or received over one
connection.
Assembly Objects can be used to bind input data or output data. I/O data
connections are established between an Originator (O) and a Target (T) where
in this case, O is the controller and T is this module. Output data is sent in the
O-T direction and Input data is sent in the T-O direction. The input data
assembly therefore comprises measurements that are made by the module while
the output data assembly is used for control data being sent to the module.
Attribute Semantics
Member List
See I/O Message Formats.
Table 269 - Object Instances
Instance ID Description
0 Class Instance for the Assembly Object
100 Instance 1 defines one, input data assembly option (O- T)
101 Instance 2 defines one, output data assembly option (T - O)
Table 270 - Class Attributes
Attribute
ID Access
Rule NV Name Data
Type Description of Attribute Semantics of
Values
1 Get NV Revision UINT Defines the current revision of
the Assembly Object Current: 2
2 Get V Maximum
Instance UINT 101
Table 271 - Instance Attributes
Attribute
ID Access Rule NV Name Data Type Description of Attribute Semantics of
Values
3 Get - Data STRUCT The input or output data -
4 Get V Size UINT The assembly (data) size Number of bytes
IMPORTANT Set access for Output data is not allowed as a security measure to help
prevent disruption of controlled modules.
Common Services
Service
Code Implementation Service Name Description of Service
Class Instance
0x0E x x Get Attribute Single Returns the contents of the specified
attribute