Rockwell Automation RECOMM-DNET DeviceNet Adapter for use with DPI AC Drives User Manual
Page 59
Using I/O Messaging
6-5
6.5.2 32-Bit Parameters Using 16-Bit Datalinks
To read (and/or write) a 32-bit parameter using 16-bit Datalinks,
typically both Datalinks (A,B,C,D) are set to the 32-bit parameter.
For example, to read Elapsed MWH (9), both Datalink A1 and A2
are set to “9.” Datalink A1 will contain the least significant word
(LSW) and Datalink A2 the most significant word (MSW). In this
example, the parameter 9 value of 5.8MWh is read as a “58” in
Datalink A1.
Regardless of the Datalink combination, x1 will always contain the
LSW and x2 will always contain the MSW. In the following
examples, Power Up Marker (242) contains a value of 88.4541
hours.
32-bit data is stored in binary as follows:
Example:
Power Up Marker (242) = 88.4541 hours
MSW = 13
decimal
= 1101
binary
= 2
16
+ 2
18
+ 2
19
= 851968
LSW = 32573
851968 + 32573 = 884541
Datalink
Most/Least
Significant Word
Parameter
Data (decimal)
A1
LSW
9
58
A2
MSW
9
0
Datalink
Most/Least
Significant Word
Parameter
Data
(decimal)
A1
LSW
242
32573
A2
- Not Used -
0
0
Datalink
Most/Least
Significant Word
Parameter
Data
(decimal)
A1
- Not Used -
0
0
A2
MSW
242
13
Datalink
Most/Least
Significant Word
Parameter
Data
(decimal)
A2
MSW
242
13
B1
LSW
242
32573
MSW
2
31
through 2
16
LSW
2
15
through 2
0