Rockwell Automation 20A PowerFlex 70EC/700VC - Manual (Page 29)

Datalinks 25
Rules for Using Datalinks
•
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.
•
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.
•
Parameter settings in the drive determine the data passed through the Datalink
mechanism
•
When Datalinks are used to change a value in the drive, 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.
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
Programmable
Controller
I/O Image Table
Remote I/O
Communication
Module
Adjustable Frequency
AC Drive
Block Transfer
Logic Command
Analog Reference
WORD 3
WORD 4
WORD 5
WORD 6
WORD 7
Output Image
Data In A1
Data In A2
Data Out A1
Data Out A2
300
301
310
311
Parameter/Number
Block Transfer
Logic Status
Analog Feedback
WORD 3
WORD 4
WORD 5
WORD 6
WORD 7
Input Image
Datalink A
Datalink A