Allen-Bradley Powermonitor 3000 User Manual page 313

Allen-Bradley HMIs
Set Attribute Single Service
The Set Attribute Single service sets the single attribute specified by
the parameter Attribute ID to the value specified by the parameter
Attribute Data.
Table F.16 Request Parameters
Parameter Data Type Description
Attribute ID UINT
Attribute Data Attribute
Specific
Assembly Object Instances
The DC's Assembly Object supports 63 instances. The Data attributes
of instances 1 and 2 are accessed via Class 1 scheduled connections,
while the Data attribute of instances 3 to 73 are accessed via Class 3 or
UCMM unscheduled connections.
The table shown in Appendix A of this document defines the size and
content of the Data attribute for each of those instances.
Connections
The Assembly Object will support both scheduled (Class 1) and
unscheduled (Class 3 & UCMM) connections. A maximum of 64 Class
1 connections are supported to instance 1 of the Assembly Object, but
only 1 is supported to instance 2 of the Assembly Object.
Unscheduled connections (Class 3 & UCMM) can also be used to
access instances 1 – 51 of the Assembly Object.
Behavior
The purpose of the Assembly Object is to act as a network interface to
the PM 3000's data. That data is accessed by a variety of means.
Instances 1 and 2 of the Assembly Object support Class 1 connections
in order to provide network scanners with access to the PM 3000's I/O
data. Such messaging is said to be I/O Messaging. The remainder of
Powermonitor 3000 EtherNet/IP Device Profile
Identifies the attribute to be read / returned
Contains the value to which the specified attribute is to be
set
Publication 1404-UM001D-EN-E - October 2004
F-7