MOVIDRIVE
®
DFC11A CAN Bus
21
Parameter Setting via
CAN Bus
4
4.1.3 Sequence of Parameter Setting via CAN
Using the WRITE SYNC service as an example, Fig. 19 shows the sequence of parameter setting
between control system and drive inverter on the CAN bus. To simplify the sequence, only the
management byte of the parameter message is shown in Fig. 19.
While the higher-level control system sets up the parameter message for the WRITE SYNC service,
the drive inverter receives the SYNC messages and receives and returns Process Data messages.
The service is activated when the inverter has received the Parameter Request message. The drive
inverter then looks at the parameter message and processes the WRITE SYNC service, and, at the
same time, responds to all Process Data messages. The drive inverter will only send the Parameter
Response message when it has received the SYNC message.
01028AEN
Fig. 19: Sequence of parameter adjustment via CAN
4.1.4 Parameter Data Format
When setting parameter via the fieldbus interface, the same parameter coding is used as when
setting them via the RS-232 and RS-485 serial interfaces.
For details of the data formats and value ranges of the individual parameters please refer to the
SEW MOVIDRIVE
®
Manual.
4.2
Drive Parameter Description
The drive parameters of the MOVIDRIVE
®
drive inverter are described in detail in the Fieldbus Unit
Profile Manual. In addition to the parameter index, i.e. the number with which you can address the
appropriate parameter via the communications interfaces of the inverter, you will find further
information about the coding, range of values and meaning of the parameter data.
01110010
01110010
Control
(Master)
CAN
Drive inverter
(Slave)
Process output data message
SYNC message
Process input data message
send
Parameter message
send
process output data
send
SYNC message
Receive process
input data
Service was
performed correctly
Receive Request message
Receive process output data
SYNC message received,
upon receipt parameter response
message and process input
data message are sent.
