Lenze ELCAMZIxxx4SNNPSNN (LCU122) - Manual (Page 47)

PROFIsafe on board
Process data transfer
6
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47 EDSLCMX3024-SPS EN 5.0
6.3 Process data transfer
PROFIBUS transmits different telegram contents between the master computer and the
motor starters:
ƒ Parameter data
ƒ Process data
ƒ PROFIsafe
As indicated in the table, this data is distributed into different communication channels
according to their time-critical response.
Process data
z Process data is transferred via the process data channel.
z
Use process data to control the motor starter.
z The master computer has direct access to the process data. In the PLC, for instance, the data is directly
assigned to the I/O area. An exchange between the master drive and the motor starter is required in the
shortest possible time with small amounts of data being transferred cyclically.
z
Process data is
– not stored in the motor starter.
– transferred between the host and the motor starters in order to exchange current input and output data
continuously.
z Process data for instance refers to setpoints and actual values.
An exchange between the master drive and the motor starter is required in the shortest possible time with small
amounts of data being transferred cyclically.
Parameter data
z Parameter data is transferred via the parameter data channel.
z
If the parameter data channel is active, it additionally occupies 4 words of input and output process data.
z Observe the notes on code C0003 when saving parameter changes.
z In general, the transfer of parameters is not time-critical.
z Parameter data for instance refers to operating parameters, diagnostics information and motor data.
Tab. 6-1 Distribution of parameter data and process data into different communication channels