NORD Drivesystems BU0570 - Manual (Page 18)

EtherCAT bus module for NORD frequency inverters SK 5xxE
18 Subject to technical amendments BU 0570 GB-0312
4.2 Process data
Control words and setpoints are transferred from the bus master to the SK TU3-…bus module as process
data and in return, the status word and actual values are sent to the bus master / controller from the FI.
Transfer is carried out cyclically. The bus master / controller can access these process values directly, as
they are stored in the I/O area.
For EtherCAT the length and structure of the process data are fixed and are determined by the XML-File.
According to the SK TU3-ECT / FI combination, 4 or 6 process values are available.
The allocation of the values transferred in the setpoint/actual value area of the FI is made via the
parameters P543 to P548 or P543 [-01]…[-05].
4.2.1 Process data structure
The structure of the process data is defined by the XML file.
Direction of
transmission
Transmitted data
( 8 Byte )
1st word 2nd word 3rd word 4th word
... to SK TU3 Control word Setpoint 1 Setpoint 2 Setpoint 3
... from the SK TU3 Status word Actual
value 1 Actual
value 2 Actual
value 3
Table 11: Process data structure SK 500E to SK 535E
Direction of
transmission
Transmitted data
( 12 Byte )
1st word 2nd word 3rd word 4th word 5th word 6th word
... to SK TU3 Control word Setpoint 1 Setpoint 2 Setpoint 3 Setpoint 4 Setpoint 5
... from the SK TU3 Status word Actual
value 1 Actual
value 2 Actual
value 3 Actual
value 4 Actual value 5
Table 12: Process data structure SK 540E to SK 545E