332 PROFINET IO – Communication protocol
Data block
The data block contains a PROFIdrive-specific request or
response header.
The table below shows the contents of the PROFIdrive request.
Additional value 1
(response only)
Field for transferring
additional data
UI16
Additional value 2
(response only)
Field for transferring
additional data
UI16
Padding 24 bytes for request, 20 bytes for response.
Data block Used only with write request and read response.
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 (01h)
Change
Parameter (02h)
Byte
Drive Object ID To be set to 0 or 1. 0…255 Byte
No. of
Parameters
Number of the
parameters that are
present in the request
1…37 Byte
Attribute Type of the object being
accessed.
Note: “Description” and
“Text” are not
supported.
Value (10h)
Description (20h)
Text (30h )
Byte
No. of Elements Number of the array
elements accessed or
length of the string
accessed. Set to 0 if
non-array parameters
are used.
0, 1…234 Byte
Field(s) Description Range Type
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