Communication
84
Table 17. PROFIdrive Request header
Field(s) Description Range
Byte/
Word
Request
Reference
Unique identification set by the
master. Changed for each new
request.
1 … 255 Byte
Request ID Request type for the issued block. Request
Parameter (0x01)
Change
Parameter (0x02)
Byte
DO-ID To be set to 0x01. 0 … 255 Byte
No. of
Parameters
Number of parameters that are
present in the request.
1 … 37 Byte
Attribute Type of object being accessed.
Note: “Text” is not supported.
Value (0x10)
Description (0x20)
Text ( 0 x 3 0 )
Byte
No. of
Elements
Number of array elements
accessed or length of string
accessed. Set to 0 if non-array
parameters are used.
0, 1 … 234 Byte
Parameter
Index
(group)
Address of the PROFIdrive
parameter that is being accessed.
Also "0" is allowed by RETA-02.
Parameter group of the drive
when accessing drive parameters.
1 … 65535 Word
Subindex
(parameter)
Addresses the first array element
of the parameter or the beginning
of a string access or the text array,
or the description element that is
being accessed. Parameter
number if accessing drive
parameters.
0 … 65535 Word
Format* See Table 21. See Table 21. Byte
Number of
Values*
Number of values following. 0 … 234 Byte
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