Siemens 6RA7086-6KS22 Operating Instructions Manual page 191

05.05
Since a variety of different functions can be used to transfer PZDs simultaneously, data are
overlayed in the drive. For example, the first PZD from PZD Receive and PZD Receive
Broadcast are always interpreted as the same control word 1. For this reason, care should
be taken to ensure that data are transferred in meaningful combinations.
Two CAN identifiers are required for the purpose of processing parameters, i.e. one CAN identifier
for PKW Request (parameter request job to drive) and one CAN identifier for PKW Response
(parameter response by drive). These assignments are made in CB parameters as shown in the
following diagram:
Node address
of drive (P918)
Basic identifier for
parameterizing (U711)
Example of PKW data exchange:
P918 = 1
U711 = 298
Structure of a telegram for PKW data exchange:
The telegram consists of the following data words:
Identifier
ID is the CAN identifier that is defined for the COB in question by parameterization.
PKE contains the request or response ID and the parameter number
Request or response ID
Bit 0 to bit 10 contain the number of the parameter concerned. Bit 12 to bit 15 contain the
request or response ID.
The index IND contains the value 0 for unindexed parameters, for indexed parameters it
contains the corresponding index value. Bit15 also has a special function as the page select
bit for parameter numbers greater than 1999.
The index value 255 means that the request concerns all indices of the parameter in
question. For a change request, the parameter values must then be passed on for all indices
of the parameter. Because a COB can only contain up to 4 data words (8 bytes) of net data,
use of this request is only possible for parameters with (up to ) 2 indices. In the other
direction, the drive supplies all index values in the response telegram to a read request.
Details about the telegram structure can be found in Section 7.7.9, "Structure of
request/response telegrams".
Example of a PKW request:
Changing the parameter value of the indexed parameter P301.02 (in the RAM) to -95.00%.
The example telegram therefore contains the following values:
Request identifier
Request code
Parameter number
Index
Parameter value
SIEMENS AG 6RX1700-0AD76
SIMOREG DC Master Operating Instructions
x2
This setting assigns identifier 300 to the parameter job (request)
and identifier 301 to the parameter response.
Parameter identifier
ID PKE
300
d
7
d
301
d
2
d
9500
d
+
+1
Parameter index
IND
Parameter number
012C For use of the IDs of the example above
h
7 "Change parameter value (array word)"
h
012D => PKE = 712D
h
0002
h
DAE4
h
PKW Request
PKW Response
Parameter value 1 Parameter value 2
PWE1
PNU
h
Start-Up
PWE2
7-33