Vacon optea Installation Manual page 119

PROFINET IO
8.4.5.2 Request header
The request header consists of 4 fields, each one octet in size.
Octet
Field name
number
Request Refer-
1
ence
2 Request ID
3 Axis Number
Requested num-
4 ber of
parameters
8.4.5.3 Parameter address
The parameter address consists of 4 fields, totaling six octets in size.
Octet
Field name
number
1 Attribute
Number of ele-
2
ments
Parameter
3...4
number
5...6 Subindex
The "Parameter number" and "Subindex" fields are two-octet fields, while the "Attribute" and "No.
of elements" fields are one-octet fields.
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Table 81. Request header
Description
Unique number for each
request/response pair. This
value is changed by the
master for each new
request. It is mirrored by the
slave in the response.
Defines the type of request.
Not used, should be set to 1. Use 1, other values should not be used.
The number of parameters
affected by the request.
Table 82. Parameter address
Description
Describes which part of a
parameter should be
accessed.
Specifies the number of ele-
ments that are addressed in
an array.
The number of the parame-
ter to be addressed.
Defines the first array ele-
ment of the parameter to be
accessed.
Allowed values
A bitmask with information about the
parameter characteristics.
Use 0x01 for Read requests.
Use 0x02 for Change requests.
Other values are not allowed.
Values 1 to 39 are allowed.
The value 0 is not allowed.
Values 40 to 255 are not allowed.
Allowed values
Use 0x10 for reading/writing the value
of a parameter.
Use 0x20 for reading the description of a
parameter.
Use 0x30 for reading the text of a
parameter (not supported).
Other values should not be used.
Values 0 and 1 are allowed for non-array
parameters.
Values 1 to 234 are allowed for array
parameters.
Other values should not be used.
Allowed values are those of supported
parameters, see chapter 8.4.6.2.
Values 0 to 65535 are allowed.
Other values are not allowed.
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