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Data transmission with PDO and SDO
Operation manual
ID 441896.05
WE KEEP THINGS MOVING
25
7
The selection of parameter 2808
hex
/ 0 (parameter
E08
n-motor with 16 bits of
data) is shown below as an example of how it is transferred in an SDO telegram.
When the parameter is to be mapped to the first position on the 1st PDO (rx)
channel, the telegram must be addressed to the parameter with index 1600
hex
and subindex 1.
... via POSITool
With the POSITool software mapping is set in the parameter list. The parameter
belonging to the particular channel must be called in the parameter list of the
global area (in our figure:
A225
). The coordinates of the parameters which are to
be mapped to the 1st PDO (rx) telegram are entered in parameter elements 0 to
5. In Fig. 7-1parameter
A180
is the first mapped parameter.
Fig. 7-1 Mapping in POSITool
When parameters from an axis are mapped the prefix must be specified:
2.
B11
(nominal motor power, parameter of the second axis)
List of the parameters which can be mapped to process data
PDO mapping cannot be used for all parameters. The parameters which can be
mapped are identified in the parameter list with the abbreviation "PDO" with the
fieldbus notes.
Useful process data for applications
When an application is used and control is handled via fieldbus the process data
channels are pre-assigned.
7.1.2
Process data - example of fast reference values
The following process data are recommended for control of the fast reference
value application with EtherCAT. The selection is preset but can be changed in
POSITool.
LSB
MSW
1
st
byte
2
nd
byte
3
rd
byte
4
th
byte
Length
Subindex
LSB
MSB
in Bit
Index
Length
Subindex
Index
10
hex
00
hex
08
hex
28
hex