Rockwell Automation RECOMM-ENET EtherNet/IP Communications Module - Manual (Page 66)

6-8 EtherNet/IP Communications Module
6.5.1 32-Bit Parameters using 16-Bit Datalinks
To read (and/or write) a 32-bit parameter using 16-bit Datalinks,
typically both Datalinks of a pair (x1 and x2) are set to the same 32-
bit parameter.
For example, to read Elapsed MWh (9) in an SP600 drive, 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 5.8 MWh 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 19 + 2 18 + 2 16 = 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