Lenze 3241C - Manual (Page 13)

API functions 3
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11
3.4 Communication
In this chapter the transmission/reception of process data (PDOs) and configuration
data (SDOs) is described.
3.4.1 SDO communication
Configuration data (SDOs)
During writing the configuration data the SDOs are stored directly in an output buffer
of the driver. Access is basically initiated by the IPC. The BPB controller then responds
accordingly. If the SDOs can be written to the corresponding FIFO of the backplane
bus, they are transmitted. A definite job number is assigned to each SDO by the driver,
in order to be able to assign responses to the response FIFO and store them in the
corresponding input buffer of the application.
Abb. 2 FIFOs, buffers, and job numbers
Response
FIFO
SDO +
Job number
Response +
Job number
Transmission:
SDO
Application interface
Reception:
Respond
PCI BPB BPB driver
Output buffer
Input buffer
Application
interface
Reception
FIFO