156 Communication protocol
The table below shows the contents of the 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 (01h)
Change
Parameter (02h)
Byte
Drive Object
ID
To be set to 0 or 1. 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: “Description”
and “Text” are not
supported.
Value (10h)
Description (20h)
Text (30h)
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
Address of the
parameter that is
being accessed. “0” is
allowed by FPBA-01.
1…65535 Word
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