Lenze 931W - Manual (Page 50)

Parameter channel (PCV mechanism)
Job and response processing
Transfer of PPO with PROFIBUS-DP
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50 K-HB 13.0001-EN 2.1
7.3.5 Transfer of PPO with PROFIBUS-DP
The DP function Data_Exchange
In case of PROFIBUS-DP the cyclic data exchange with PPOs is available only. For this
purpose, DP provides the function Data_Exchange, which serves to transmit cyclic data to
the slave and collect them at the same time. The input or output data exchanged with
Data_Exchange correspond to the PPO types described. However, changing the PPO type
during the operation is not possible.
The DP function Set_Prm
This function serves to transmit 7 bytes of PROFIBUS-DP-specific information to the slave.
The option to transmit device-specific parameters (User_Prm_Data) from byte 8 to 244 is
not used.
The DP function Slave_Diag
This function serves to read 6 bytes of PROFIBUS-DP-specific diagnostic information and
2 further bytes Ext_Diag_Data out of the slave. The Ext_Diag_Data provides a
device-specific diagnostics, in which error messages of the slave are displayed. The output
of the drive-specific diagnostics can be switched off by parameter setting.
Synchronisation of several devices, the DP_function Global Control
The DP function Global Control serves to synchronise several drives. If a master sends a
sync control command, the outputs of the addressed slaves are frozen to the momentary
value. Inthefollowing userdatatransmissions,the outputdataarestored inthe slaves,the
output data remains unchanged. When giving the next sync control command the stored
output data are transmitted to the outputs. An unsync control command serves to exit the
sync operation.
By analogy with this, the freeze control command enables the input states to be frozen to
the momentary value and to be collected with the next user data transmission. The input
data are only updated again, when the DP master transmits the next freeze control
command to the devices concerned. The freeze operation is exited with an unfreeze
control command.
The DP function Set_Slave-Add
This optional function is not implemented.