PROFIBUS DP mapping
PKW aperiodic service
The PKW service, consisting of PKE, R/W, R/W/N and PWE, enables aperiodic access to Altivar 312 parameters in read and write mode.
Output PKWs
PKE
Parameter logic address
R/W
0:No request
1:Read
2:Write
Note:
Values other than 0, 1 and 2 should not be used.
PWE
If write: Value to be written
Input PKWs
PKE
Copies the output PKE value
R/W/N
0:No request
1:Correct read operation
2:Correct write operation
7:Read or write error
PWE
•If correct read operation: Parameter value. This can be limited by the drive if the maximum value is exceeded by the write operation.
•If correct write operation: Value of the write PWE
•If there is an error:
0:Incorrect address
1:Write operation refused
Note:
The parameters in the output PZDs should not be changed by the PKW service.
Parameters linked to output PZDs should not be changed by the PKW service.
Example: The speed target and the frequency target.
22 | S1A10386 10/2009 |