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PROFINET IO protocol
5.4.6.4
Response header
The response header consists of 4 fields, each one is octet in size.
Octet
Field name
number
Request Refer-
1
ence
2
Response ID
3
Axis Number
Requested num-
4
ber of
parameters
5.4.6.5
Parameter values
Parameter values are included in the response only if the request was of "Request parameter" type.
For details on the contents of this field, see Parameter value on Chapter 5.4.5.4 "Parameter value"
5.4.7
Drive parameter access using application ID
It is possible to read and write drive parameters using the application ID number using the PNU
10001. The targeted application ID is put into the subindex field.
5.4.8
Parameter channel examples
The parameter channel operations follow the same process every time. Figure 8 shows a success-
ful operation. It is important to wait long enough after "Write request" before doing "Read request".
If read operation is done too soon, drive has not finished processing the operation and will respond
with error (see Figure 2 PROFIdrive parameter access model). Then the PLC must try to read again
after some time. Time between write and read requests depends on the operation. Figure 4 shows
what the parameter request looks like in Wireshark and Figure 5 shows how "PROFINET Master
Simulator" tool is used for requesting the value.
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
Table 37.
Response header
Description
Unique number for each
request/response pair.
Defines the type of
response. An error in the
execution of a request is
indicated by setting bit 7 in
this field.
Not used, should be set to 1. Mirrored by the slave.
The number of parameters
affected by the request.
Allowed values
Mirrored by the slave.
Uses 0x01 for successful request
parameter operation.
Uses 0x02 for successful change
parameter operation.
Uses 0x80 to indicate that an invalid
request ID was received.
Uses 0x81 for unsuccessful request
parameter operation.
Uses 0x82 for unsuccessful change
parameter operation.
Other values are not used.
Number of parameters in the response.
Mirrored from the request.
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