Vacon 100 Installation Manual page 19

Commissioning
Octet
Field name
number
1 Attribute
2 Number of elements
3...4 Parameter 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.
4.4.2.3 Parameter value
The parameter value field is included only in Change requests (not in Read requests). The parame-
ter value field consists of a two-octet parameter value header followed by a list of values. Depend-
ing 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 mes-
sage.
Octet
Field name
number
1 Format
2 Number of values
3... Value
Because of the limitation in the maximum length of the Parameter Access messages (PROFIBUS
DP: 240 bytes), the number of values which can be transmitted in one frame is limited by the pa-
rameter format.
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Table 11.
Description
Describes which part of a
parameter should be
accessed.
Specifies the number of
elements that are
addressed in an array.
The number of the
parameter to be
addressed.
Defines the first array
element of the parameter
to be accessed.
Table 12.
Description
Describes the data type of
the parameter.
Defines the number of
values in the parameter
value field.
The value of the
parameter.
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 4.4.4
Values 0 to 65535 are allowed.
Other values are not allowed.
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.
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