Manual – MOVIDRIVE® MDX60B/61B Communication and Fieldbus Unit Profile
111
7
Setting the inverter parameters
SEW Unit Profile
If the write service cannot be executed in the drive inverter, for example because
incorrect parameter data were transmitted, the programmable controller will receive a
negative read response
. In this way, the programmable controller receives a negative
acknowledgement
(write error confirmation)
with exact identification of the error.
Writing a
parameter
cyclically
For the cyclic transmission method, the handshake bit has to be changed to activate
service processing (execution of WRITE service). When using acyclic PDU types, every
inverter processes every request telegram and in this way always executes the
parameter channel.
The parameters are set as follows:
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
management byte (byte 0).
4. With cyclic PDU types, the WRITE service is not passed to the inverter until the hand-
shake bit is changed. With acyclic PDU types, the parameter channel is always
executed.
The inverter now processes the write service and sends the service confirmation back
by changing the handshake bit.
The data length is 4 bytes for all parameters of SEW drive inverters.
Byte 0: Management
7
6
5
4
3
2
1
0
0
0/1
1
1
0
0
1
0
Service identifier:
0010 = Write
Data length:
11 = 4 bytes
Handshake bit:
Must be changed with every new job.
Status bit:
0 = No error while executing service
1 = Error while executing service
0/1 = Bit value is changed
Summary of Contents for MOVIDRIVE MDX60B
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