09.02 Start-Up
Siemens AG 6SE7087-6AK85-1AA0
4-73
Rectifier/Regenerating Unit Operating Instructions
4.5.6 Structure of request/response telegrams
There is no basic difference between the useful data area in the request and response telegrams for
PROFIBUS and CAN Bus. The only difference between the two types of bus telegram is in the protocol frame
and the transmission sequence of H and L bytes. The structure of the protocol frame and the transmission
sequence of bytes are therefore described where necessary in the sections containing the start-up description
for the appropriate board.
Each request and each response basically comprises three areas apart from the telegram frame with header
and trailer:
Header
Trailer
Index
IND
Parameter value
PWE
Parameter identifier
PKE
The
parameter identifier (PKE) contains a request or response identifier (i.e. type of request or response) and
the number of the addressed parameter. The spontaneous signaling bit SPM (bit11) is not used on the
SIMOVERT 6SE70 Common Rectifier.
Header Trailer
Index
IND
SPM
Parameter value
PWE
Parameter identifier
PKE
Task/ response
identifier
Parameter number (PNU)
Bits 0 to 10 contain the number of the parameter specified in the request.
Parameter number (PNU):
Parameter area Displayed
number
Input on OP1S PNU in parameter
identifier
Basic unit
Pxxx, rxxx
0 - 999 0 - 999
Technology board
Hxxx, dxxx
1000 - 1999 1000 - 1999
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