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PROFINET IO
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The table below contains descriptions of parameters.
Table 80. Parameter description
8.4.5.1
Parameter requests
There are two types of parameter requests in PROFIdrive:
•
Read requests for reading parameters from the device
•
Change requests for writing parameters to the device
Each parameter request consists of three elements:
•
Request header
•
Parameter address
•
Parameter value (only in Change requests)
Sub-
index
Field name
Data type
Description
1
Identifier (ID)
Unsigned16
A bitmask with information about the
parameter characteristics.
2
Number of array ele-
ments
Unsigned16
For array parameters, the number of
elements in the array.
3
Standardisation factor
FloatingPoint (IEEE
754)
If the information represented by the
parameter can be converted into a stan-
dardised form, this field contains a fac-
tor for this conversion.
4
Variable attribute
Array of two
Unsigned8
Contains two index numbers for
describing the parameter information.
5
Reserved
Array of four
Unsigned8
Reserved, always 0.
6
Name
ASCII string, 16 char-
acters
Symbolic name of the parameter.
7
Low limit
Array of four
Unsigned8
Limit for valid values of the parameter.
8
High limit
Array of four
Unsigned8
Limit for valid values of the parameter.
9
Reserved
Array of two
Unsigned8
Reserved, always 0.
10
ID extension
Unsigned16
Not used, always 0.
11
Normalisation refer-
ence parameter
Unsigned16
Parameter number, the value of which
is used as normalisation reference for
the parameter whose description this
is.
12
Normalisation field
Unsigned16
Contains information about normalisa-
tion of this parameter.
Request header
Parameter
address(es)
Parameter value(s)
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