Data Structure For Parameter Access - Profidrive - WEG CFW500 User Manual

Positive Response
(slave -> master)
Negative Response
(slave -> master)
Reading Telegram (DS_Read):
Request
(master -> slave)
Positive Response
(slave -> master)
Negative Response
(slave -> master)
Each telegram field can assume the following values:
Function
Slot
Index
Size
Error Decode
Error Code 1
Error Code 2
Request Data
Response Data
5.2.4 Data Structure for Parameter Access – PROFIdrive
The CFW500 frequency inverter makes available the access to the inverter entire parameter list through the
acyclic data, according to the PROFIdrive specification. According to the specification, the access to the global
parameters is achieved through the following addressing:
Slot 0

Index 47

Through this slot and index, one must use the structure to access the parameters defined in the PROFIdrive
specification, in order to perform readings and modifications of the CFW500 frequency inverter parameters. Thi s
access uses the following mechanism:
1. Either the reading or the modification of parameters must begin with a writing DP-V1 telegram (DS_Write) at
the slot 0 index 47, with the request of the parameter to the drive.
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Header
Function
5Fh
Header
Function
DFh
Header
Function
5Eh
Function
Header
5Eh
Header
Function
DEh
5Fh – Writing request, positive response for writing
5Eh – Reading request, positive response for reading
DFh – Negative response for writing
DEh – Negative response for reading
0 (It is the standard slot for accessing the drive parameters, according to PROFIdrive)
47 (It is the standard index for accessing the drive parameters, according to PROFIdrive)
Number of bytes for reading and writing.
Writing request: 'n' bytes, according to the number of bytes in the request telegram.
Positive response for writing: 0 bytes
Reading request: 240 bytes (It requests the maximum number of reading bytes, because the size of the
slave response is variable).
Positive response for reading: 'n' bytes, according to the number of bytes in the response telegram.
128
Error code, according to the problem found in the request:
B0h: access error – invalid slot
B2h: access error – invalid index
B5h: access error – modification not allowed for the parameter
B6h: access error – modification in read-only parameter
B7h: access error – incorrect values for parameter access
B8h: access error – invalid parameter number
C3h: Resource error – Response not available for the reading request
0
Variable size field of the writing request (DS_Write), which contains the data for accessing the drive
parameters.
Variable size field of the reading response (DS_Read), which contains the result of the access to the drive
parameters.
Data Unit (DU)
Slot Index
0 47
Data Unit (DU)
Error Decode Error Code 1
128 xx
Data Unit (DU)
Slot Index
0 47
Data Unit (DU)
Slot Index
0 47
Data Unit (DU)
Error Decode Error Code 1
128 xx
Size
0
Error Code 2
xx
Size
240
Size Request
n Data
(n bytes)
Error Code 2
xx
End
End
End
End
End