Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx - Manual (Page 68)

7-2 Using Datalinks with All Protocols
20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
32-bit data is stored in binary as follows:
In this example, the Parameter 10 - [Elapsed Run Time] value of 6553.9 Hrs
is read as “6553.9” in Datalink A1 Out and Datalink A2 Out.
Conversion Example:
Parameter 010 - [Elapsed Run Time] = 6553.9 Hrs
MSW = 0001
hex
= 0001
binary
= 2 16 = 65536
LSW = 0003
hex
=3
Engineering Value = 65536 + 3 = 65539
Parameter 10 Displayed Value = 6553.9 Hrs
Regardless of the Datalink combination, Datalink x1 Out will always
contain the LSW and Datalink x2 Out will always contain the MSW. In the
following example, the PowerFlex 70 drive Parameter 242 - [Power Up
Marker] contains a value of 88.4541 hours.
Conversion Example:
Parameter 242 - [Power Up Marker] = 88.4541 hours
MSW = 000D
hex
= 1101
binary
= 2
19
+ 2
18
+ 2
16
= 851968
LSW = 7F3D
hex
= 32573
Engineering Value = 851968 + 32573 = 884541
Parameter 242 Displayed Value = 88.4541 Hrs
Configuring Datalinks
Configuring Datalinks from the drive side is a two-step process:
1. Configure the datalink parameters in the drive. For example, in a
PowerFlex 70 or 700 drive, set Parameters 300 - [Data In A1] to 317 -
[Data Out D2] to “point” to the parameters to be accessed. For
instance, to read drive Parameter 1 - [Output Freq], set Parameter
310 - [Data Out A1] to “1.”
2. Enable the desired Datalinks in Parameter 16 - [DPI I/O Cfg] in the
adapter. This tells the adapter to transfer Datalink data to and from the
drive. For example, to enable Datalink A1, set bit 1 to “1.” For details,
refer to
Setting the I/O Configuration on page 3-5 .
MSW 2 31 through 2 16
LSW 2
15
through 2
0
Datalink Word Parameter Data (Hex)
A1 Out LSW 10 0003
A2 Out MSW 10 0001
Datalink Word Parameter Data (Hex)
A2 Out MSW 242 000D
B1 Out LSW 242 7F3D