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PROFINET IO
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
8.4.6.5
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 8.4.5.4 "Parameter value"
8.4.7
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.
8.4.8
Parameter channel examples
The parameter channel operations follow the same process every time. Figure 41 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.
Parameter operations sent to the AC drive must be directed to: slot 0, subslot 1 and to index 0xB02E
Figure 41.Successful paramater channel operation
Figure 42.Wireshark capture of requesting value for ID103
11753_uk
Modbus TCP Communication
PLC
Drive
Write request
Read request
Write response (OK)
Read response (OK)
PLC waits until drive has finished processing the request
Drive responds with operation result
(for example: operation OK, value is
100).
PLC sends request for the result of
the operation
Drive responds that it will process
the request
PLC sends request for an operation
(for example reading value for an ID)
Summary of Contents for optea
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