Allen-Bradley PowerFlex 70 Enhanced Control Reference Manual page 29

Programmable
Controller
I/O Image Table
Output Image
Block Transfer
Logic Command
Analog Reference
WORD 3
WORD 4
WORD 5
WORD 6
WORD 7
Input Image
Block Transfer
Logic Status
Analog Feedback
WORD 3
WORD 4
WORD 5
WORD 6
WORD 7
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
Datalink Most/Least Significant Word Parameter
A1 LSW
A2 MSW
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
A1 LSW
A2 -Not Used-
Remote I/O
Communication
Module
Datalink A
Datalink A
Data (decimal)
9 58
9 0
Data (decimal)
242 32573
0 0
Datalinks 25
Adjustable Frequency
AC Drive
Parameter/Number
Data In A1 300
Data In A2 301
Data Out A1 310
Data Out A2 311