Lenze E94AYCPM - Manual (Page 43)

Lenze · E94AYCPM communication module (PROFIBUS®) · Communication Manual · DMS 12.0 EN · 11/2012 · TD17
43
7 Data transfer
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
7 Data transfer
The PROFIBUS master and controller 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
controller, 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 drive controller.
• The host (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 controller.
• Process data are transferred cyclically between the host system and the controllers (permanent
exchange of current input / output data).
• Process data are, for instance, setpoints, actual values, control words and status words.
• The Servo Drives 9400 can exchange a maximum of 32 process data words (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 data changes must be saved via code C00002 of the Servo Drives 9400.

Note!
Observe the direction of the information flow!
Process input data (Rx data):
• Process data from the controller (slave) to the master
Process output data (Tx data):
• Process data from the master to the controller (slave)