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vacon • 34
5.4.5.3
Parameter address
The parameter address consists of 4 fields, totaling six octets in size.
Octet
Field name
number
1
Attribute
Number of ele-
2
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.
5.4.5.4
Parameter value
The parameter value field is included only in Change requests (not in Read requests). The parameter
value field consists of a two-octet parameter value header followed by a list of values. Depending
on the format of the parameter, the octet size of a single value is one, two or four octets. The total
size of the parameter value field thus depends on the format and number of values in the message.
Octet
Field name
number
1
Number of val-
2
3...
The number of values which can be transmitted in one frame has been limited to 39.
5
Table 32.
Description
Describes which part of a
parameter should be
accessed.
Specifies the number of ele-
ments that are addressed in
ments
an array.
The number of the parame-
ter to be addressed.
Defines the first array ele-
ment of the parameter to be
accessed.
Table 33.
Description
Describes the data type of
Format
the parameter.
Defines the number of val-
ues in the parameter value
ues
field.
Value
The value of the parameter.
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Parameter address
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 5.4.6.2.
Values 0 to 65535 are allowed.
Other values are not allowed.
Parameter value
Allowed values
Use 0x41 for Byte.
Use 0x42 for Word.
Use 0x43 for Double Word.
Value 0x44 is used for Error.
Other values should not be used.
Values 0 to 234 are possible. Subject to
limitations as described below.
Values 0 to 65535 are allowed.
Other values are not allowed.
PROFINET IO protocol
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