Allen-Bradley 1440-SDM02-01RA, User Manual, Page: 106 / 168

106 Rockwell Automation Publication 1440-UM001D-EN-P - September 2016
Chapter 3 Operate the Module
Poll Message Format
The XM-124 module Poll request message contains no data. The Poll response
message can contain up to 44 REAL values for a total of 176 bytes.
The XM-124 module provides one pre-defined (static) data format of the Poll
response, which is defined in Assembly Instance 101. It also provides a dynamic
Assembly Instance, instance 199, with which you can define a custom data
format for the Poll response. The dynamic Assembly Instance can contain any
of the measurement parameters included in Assembly Instance 101 and several
of the alarm and relay configuration parameters.
The default Assembly Instance is 101 and the default size is 20 bytes. You can
change the Assembly Instance and define the custom Assembly Instance with
the configuration software.
Refer to I/O Data Tab on page 93 .
The Poll response data can also be requested explicitly through Assembly
Object (Class ID 0x4), Instance 101 (0x65), Data Attribute (3). When you
explicitly request the Data Attribute for Assembly Instance 101, it returns the
entire 176 bytes.
Table 24 shows the static data format of Assembly Instance 101.
Table 24 - XM-124 Module Assembly Instance 101 Data Format
Byte Definition
0…3 Channel 1 Overall measurement value
4…7 Channel 2 Overall measurement value
8…11 Channel 1 Gap measurement value
12…15 Channel 2 Gap measurement value
16…19 Current Speed measurement value
20…23 Peak Speed measurement value
24…27 Channel 1 Band 1 measurement value
28…31 Channel 2 Band 1 measurement value
32…35 Channel 1 Band 2 measurement value
36…39 Channel 2 Band 2 measurement value
40…43 Channel 1 Band 3 measurement value
44…47 Channel 2 Band 3 measurement value
48…51 Channel 1 Band 4 measurement value
52…55 Channel 2 Band 4 measurement value
56…59 Channel 1 1X Vector Magnitude measurement value
60…63 Channel 1 1X Vector Phase measurement value
64…67 Channel 2 1X Vector Magnitude measurement value
68…71 Channel 2 1X Vector Phase measurement value