Lenze 931W - Manual (Page 26)

Commissioning
PROFIBUS communication
Structure of communication channel
5
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26 K-HB 13.0001-EN 2.1
5.4.3 Structure of communication channel
Generally,onlycommunicationfunctions canbesetundertheHW configurationwhichare
also supported by the servo inverter. The bandwidth of this communication is defined via
the process data configuration. The parameter process data objects (PPOs) serve to select
a pre-defined write and read access to the control and status word by certain ”modules”.
Depending on the selected PPO a certain number of input and output areas, or combined
input and output areas are available. Furthermore, the area selection also determines the
consistency check, data length, and the unit of the data to be transmitted.
PPOs which are sent to the slave by the master are interpreted as output data (Write-PPO).
Master -> data -> slave: Output data.
PPOs which are received by the master from the slave are interpreted as input data
(Read-PPO). Slave -> data -> master: Input data.
Four different module combinations (PPOs) are available for the process data
configuration:
PPO type 3 PPO Write type
3 PPO Read type
4
PPO type 1 PPO Write type
1 PPO Read type
2
Process data input (input data)
PZD1: Status word X X X X
PZD2: Active travel data record X X X X
PZD3: Speed — X — X
PZD4: Torque — X — X
PZD5 ... 6: Position — X — X
Process data output (output data)
PZD1: Control word X X X X
PZD2: Actual value = active travel
data record
X X X X
Parameter data input (input data/PPO
Read)
Number — 2 2 6
Parameter data output (output data/PPO
Write)
Number — — 2 2
Tab. 6 Configuration of the PPO types
The configurations ”PPO Write type 3, PPO Read type 4“ and ”PPO type 3” cannot be used
for parameterising the drive. These configurations, however, only provide a lower
utilisation of the bus system, which means a lower data volume. They transmit 16 bytes
less data (8 bytes transmitted data and 8 bytes received data) per telegram than the PPOs
3 and 4.
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Note!
In case of some PROFIBUS master systems HIGH and LOW byte of the process
data and parameter data channel are exchanged!