NORD Drivesystems BU0590 - Manual (Page 17)

4 Communication
BU 0590 GB-0312 Subject to technical amendments 17
4 Communication
4.1 Process data
Control words and setpoints are transferred from the bus master / controller 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.
The length and structure of the process data is specified via the PPO types during the planning of the
PROFINET network.
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].
4.1.1 Process data structure
The structure of the process data is defined by the PPO type.
4.1.1.1 Pure process data communication
Direction of
transmission
Transmitted data
( 4 Byte )
1st word 2nd word
... to SK TU3 Control word Setpoint 1
... from the SK TU3 Status word Actual value 1
Table 9: PPO 3
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 10: PPO 4
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 11: PPO 6