Drive Parameter Access Using Application Id; Parameter Channel Examples - Vacon optea Installation Manual

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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
Modbus TCP Communication
PLC
Write response (OK)
Read response (OK)
8
Drive
Write request
PLC waits until drive has finished processing the request
Read request
Figure 41.Successful paramater channel operation
Figure 42.Wireshark capture of requesting value for ID103
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
PLC sends request for an operation
(for example reading value for an ID)
Drive responds that it will process
the request
PLC sends request for the result of
the operation
Drive responds with operation result
(for example: operation OK, value is
100).
PROFINET IO
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