Lenze E84AYCPM - Manual (Page 44)

Lenze · E84AYCPM communication module (PROFIBUS®) · Communication Manual · DMS 5.0 EN · 11/2012 · TD17
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7 Data transfer
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7 Data transfer
The PROFIBUS master and inverter communicate through the exchange of data telegrams via
PROFIBUS. The user data area of the data telegram contains parameter data or process data. In the
inverter, different communication channels are assigned to the parameter data and process data.
Communication channels
The process data channel serves to transfer process data.
• The process data serve to control the inverter.
• The controller (master) can directly access the process data. In the PLC, for instance, the data are
directly saved to the I/O area.
• Process data are not saved in the inverter.
• Process data are transferred cyclically between the controller and the inverters (permanent
exchange of current input / output data).
• Process data are, for instance, setpoints, actual values, control words and status words.
• The Inverter Drives 8400 can exchange a maximum of 16 process data word (16 bits/word) per
direction.
The parameter data channel serves to transfer parameter data.
• The parameter data channel provides access to all Lenze codes.
• In general, the parameter data transfer is not time-critical.
• Parameter data are, for instance, operating parameters, diagnostic information, and motor
data.
• Parameter changes must be saved by means of code C00002 of the Inverter Drive 8400.
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Note!
Observe the direction of the information flow!
• Process input data (Rx data):
• Process data from the inverter (slave) to the master
• Process output data (Tx data):
• Process data from the master to the inverter (slave)