102
Manual – MOVIDRIVE® MDX60B/61B Communication and Fieldbus Unit Profile
7
Setting the inverter parameters
SEW Unit Profile
7.6.1
Structure of the MOVILINK
®
parameter channel
The MOVILINK
®
parameter channel enables access to all drive parameters of the
inverter, regardless of the bus in use. Special services are available in this parameter
channel to being able to read different parameter information. It is made up of a
management byte, a reserved byte, an index word and four data bytes.
Management of
the parameter
channel (byte 0)
The entire procedure for setting parameters is coordinated using management byte 0.
This byte provides important service parameters such as service identifier, data length,
version and status of the service performed.
Index addressing
(bytes 1 - 3)
Byte 2 "index high", byte 3 "index low", and byte 1 "subindex" determine the parameter
to be read or written via the fieldbus system. All parameters of the MOVIDRIVE
®
inverter
are listed in the MOVIDRIVE
®
MDX60B/61B system manual. A special number (index)
is assigned to each parameter. This number is used to read or write the parameter.
Data range (bytes
4 - 7)
The data is located in byte 4 to byte 7 of the parameter channel. This means 4 bytes of
data can be transmitted per service. The data is always entered with right-justification;
that is, byte 7 contains the least significant data byte (Data LSB) whereas byte 4 is the
most significant data byte (Data MSB).
Management byte
Bits 0 - 3
contain the service identifier and define the service to be executed.
Bits
4 and bit 5
specify the data length in bytes; it should be set to 4 bytes for all SEW
drive inverters.
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Manage-
ment
Subindex
Index high
Index low
MSB data
Data
Data
LSB data
Parameter index
4-byte data
Byte 0: Management
MSB
LSB
Bit:
7
6
5
4
3
2
1
0
Service identifier:
0000 = No service
0001 = Read parameter
0010 = Write parameter
0011 = Write parameter volatile
0100 = Read minimum
0101 = Read maximum
0110 = Read default
0111 = Read scale
1000 = Read attribute
Data length:
00 = 1 byte
01 = 2 bytes
10 = 3 bytes
11 = 4 bytes
Handshake bit
Status bit:
0 = No error while executing service
1 = Error while executing service
Summary of Contents for MOVIDRIVE MDX60B
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