PROFINET IO
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8
8.4.5.2
Request header
The request header consists of 4 fields, each one octet in size.
Table 81. Request header
8.4.5.3
Parameter address
The parameter address consists of 4 fields, totaling six octets in size.
Table 82. Parameter address
The "Parameter number" and "Subindex" fields are two-octet fields, while the "Attribute" and "No.
of elements" fields are one-octet fields.
Octet
number
Field name
Description
Allowed values
1
Request Refer-
ence
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.
A bitmask with information about the
parameter characteristics.
2
Request ID
Defines the type of request.
Use 0x01 for Read requests.
Use 0x02 for Change requests.
Other values are not allowed.
3
Axis Number
Not used, should be set to 1. Use 1, other values should not be used.
4
Requested num-
ber of
parameters
The number of parameters
affected by the request.
Values 1 to 39 are allowed.
The value 0 is not allowed.
Values 40 to 255 are not allowed.
Octet
number
Field name
Description
Allowed values
1
Attribute
Describes which part of a
parameter should be
accessed.
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.
2
Number of ele-
ments
Specifies the number of ele-
ments that are addressed in
an array.
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.
3...4
Parameter
number
The number of the parame-
ter to be addressed.
Allowed values are those of supported
parameters, see chapter 8.4.6.2.
5...6
Subindex
Defines the first array ele-
ment of the parameter to be
accessed.
Values 0 to 65535 are allowed.
Other values are not allowed.
Summary of Contents for optea
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