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System Manual – MOVIDRIVE® compact Drive Inverters
10
Starting the inverter with PROFIBUS-DP (MC_41A)
Startup
Writing a
parameter via
PROFIBUS-DP
(Write)
To execute a WRITE service via parameter channel, the handshake bit may be changed
only after the complete parameter channel has been prepared according to the service
because of the cyclical transfer of the parameter channel. Observe the following se-
quence when writing a parameter:
1. Enter the index of the parameter to be written in byte 2 (Index high) and byte 3
(Index low).
2. Enter the data to be written in bytes 4... 7.
3. Enter the service identifier and the data length for the Write service in the manage-
ment byte (byte 0).
4. Transfer the Write service to the inverter by changing the handshake bit.
The inverter now processes the Write service and sends back the service confirmation
by changing the handshake bit.
The data length is 4 bytes for all parameters of SEW drive inverters. This service is now
transferred to the drive inverter when the handshake bit changes. This means a Write
service to SEW drive inverters generally has the management byte coding 32
hex
or
72
hex
.
Byte 0: Management
7
6
5
4
3
2
1
0
0
0/1
1
1
0
0
1
0
Service identifier:
010 = Write
Reserved
Data length:
11 = 4 bytes
Handshake bit:
Must be changed with every new job.
Status bit:
0 = No error in service execution
1 = Error in service execution
0/1 = Bit value is changed
0
0
I
Summary of Contents for MOVIDRIVE compact MCH41A
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Page 432: ......
