WEG DeviceNet CFW500 User Manual - page 27
Request Reference mirror
A mirror of the value received in the request telegram.
Response ID
It represents the type of response sent by the slave:
1 = Successful parameter reading
2 = Successful parameter modification
129 = Parameter reading with error
130 = Parameter modification with error
DO-Id Mirror
Mirror of the value received in the request telegram.
Nr. of Parameters (n)
The number of parameters accessed in the request.
Format
It defines the format of the accessed parameter:
42h = 16 bit word
44h = Parameter access error
Number of values
The number of values read from the parameter, or the number of error codes from the parameter
access.
Value
Value read from the parameter (the most significant byte is transmitted first).
Error code
In case of parameter illegal access (error in reading or writing of any of the parameters), the code of the
type of found error will be indicated:
0000h = parameter does not exist
0001h = modification of read-only parameter
0002h = parameter value out of the limits
0003h = indicated sub-index does not exist
0004h = parameter not of the array type
0005h = incorrect format for the parameter
0009h = description not available (only value)
000Fh = text not available (only value)
0016h = incorrect access to the parameter
0017h = unknown format
0018h = incorrect number of values
5.2.5 Data Structure for Parameter Access – WEG
Besides the structure for the access to the parameters according to the PROFIdrive specification, it is also
possible to use a simplified structure for the access to the parameters through the following addressing:
Slot 0.
Index 48.
With the telegrams described in the section 4.2.3, it is possible to get access to the parameters using the
following mechanism:
Parameter modification: the modification of parameters is performed with a writing telegram (DS_Write), with
4 data bytes, were the two first represent the parameter number and the two last represent the parameter
content, always with the most significant byte transmitted first. The response to the writing telegram
indicates whether or not the modification was successful.
Parameter reading: for the reading of parameters, first a writing telegram (DS_Write) with 2 data bytes
representing the parameter number must be sent. After this telegram has been successfully sent, a reading
telegram (DS_Read) must be sent, and the response will have 2 data bytes with the parameter content.
The reading telegrams as well as the writing telegrams are able to report errors in the parameter requests,
according to the codes described for the Error Code 1 field.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.ctiautomation.net - Email: info@ctiautomation.net