MOVIDRIVE
®
PROFIBUS DFP11A
31
The PROFIBUS-DP
Interface
3
3.7.4 Sequence of Parameter Adjustment via PROFIBUS-DP
Using the WRITE service as an example, Fig. 30 shows the sequence of parameter adjustment
between control system and drive inverter on PROFIBUS-DP. To simplify the sequence, only the
management byte of the parameter channel is shown in Fig. 30.
While the control system sets up the parameter channel for the Write service, the drive inverter
simply receives and returns the parameter channel. The service is first activated when the hand-
shake bit has changed, in this case from 0 to 1. The drive inverter then looks at the parameter
channel and processes the Write service, and responds to all messages, though with the hand-
shake bit still = 0. Confirmation that the service has been executed is indicated by the change of the
handshake bit in the response message from the drive inverter. The control system recognizes that
the received handshake bit is now the same as the one sent and can then prepare a new parameter
adjustment.
00152AEN
Fig. 30: Sequence of parameter adjustment via PROFIBUS-DP
3.7.5 Parameter Data Format
When parameterizing via the fieldbus interface the same parameter coding is used as when param-
eterizing via the serial interfaces RS-485 or the system bus.
For details of the data formats and value ranges of the individual parameters please refer to the
SEW MOVIDRIVE
®
Parameter List documentation.
0
0
110010
0
0
110010
0
0
110010
0
0
110010
0
0
110010
0
0
110010
0
1
110010
0
0
110010
0
1
110010
0
1
110010
0
1
110010
0
1
110010
0
1
110010
Write-Dienst
wird bearbeitet
Higher level automatic system
Drive inverter
(Slave)
PROFIBUS-DP
Parameter setting
channel is prepared
for WRITE service
Parameter setting
channel is received
but not evaluated
Parameter setting
channel is received
but not evaluated
Service acknowledge
received, as send and
receive handshake
bits the same again
Handshake bit is
toggled and service
transferred to
drive inverter
Write service
is processed
Write service is executed,
handshake bit is toggled