Rockwell Automation 1203-CN1 ControlNet Communications Module 1203-CN1 - Manual (Page 93)

Publication 1203-5.13 – February, 2002
ControlNet Objects: Class Code 0x04 — Assembly Object D-7
Class Code 0x04 — Assembly
Object The Assembly Object binds attributes of multiple objects, allowing
data to or from each object to be sent or received over a single
connection. Assembly objects are used to produce and/or consume
data to/from the network. An instance of the assembly object can both
produce and consume data from the network if designed to do so.
Important: Setting of an assembly attribute can only be accom-
plished through a connection. This feature is to prevent accidental
control of the SCANport product.
Class Attributes
Instances
Instance Attributes
Attribute ID Access Rule Name Data Type Description
1
Get Revision UINT Revision of this object. First revision,
value=1.
2
Get Max Instance UINT Maximum instance number of an object
currently created in this class level of
the device.
Instance Description
1 PLC Input Data from the SCANport Product
2 PLC Output Data to the SCANport Product
3 Controlling Heartbeat
4 Listen Only Heartbeat
5 Redundant Output
6 Dummy Configuration
Attribute ID Access Rule Name Data Type Description
1
Get Number of Members
in List UINT Number of members in attribute 2.
2
Get Member List ARRAY of
STRUCT
The member list is an array of paths.
Member Data Size UINT Size of member data (in bits).
Member Path Size UINT Size of member path (in BYTEs).
0 = Empty Path
Member Path ARRAY of
BYTES
Path to/from data for this member.
➀
3
➀
Get Data ARRAY of
BYTES
All of the member data packed into one
array.
➀
Instance attribute 3, Data, contains all of the member data packed into one array. This data may contain many
different data types. For efficiency it is best to keep this data word aligned by packing it on word boundaries and
adding padding as needed. This can be accomplished by using “empty paths” (Member Path Size = 0).