Datalinks 2-59
Rules for Using Datalinks
1. 1. A Datalink consists of 4 words, 2 for Datalink x IN and 2 for Datalink
x Out. They cannot be separated or turned on individually.
2. Only one communications adapter can use each set of Datalink
parameters in a PowerFlex drive. If more than one communications
adapter is connected to a single drive, multiple adapters must not try to
use the same Datalink.
3. Parameter settings in the drive determine the data passed through the
Datalink mechanism
4. When you use a Datalink to change a value, the value is not written to the
Non-Volatile Storage (EEprom memory). The value is stored in volatile
memory (RAM) and lost when the drive loses power.
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 Parameter 09 - [Elapsed MWh], 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 Parameter 242 - [Power Up Marker] contains a
value of 88.4541 hours.
Even if non-consecutive Datalinks are used (in the next example, Datalinks
A1 and B2 would not be used), data is still returned in the same way.
32-bit data is stored in binary as follows:
Example
Parameter 242 - [Power Up Marker] = 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
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