106
Operating Instructions – MOVITRAC® B
5
Communication and unit profile
Startup
Structure of the
MOVILINK
®
parameter channel
The MOVILINK
®
parameter channel enables access to all drive parameters of the fre-
quency inverter, regardless of the bus in use. Special services are available within this
parameter channel to being able to read various 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 parameter setting sequence is coordinated with byte 0 "Management". This
byte provides important service parameters such as service identifier, data length, ver-
sion and status of the service performed.
Index addressing
(bytes 1 – 3)
Byte 2 index high, byte 3 index low, and byte 1 sub-index determine the parameter to be
read or written via the fieldbus system. All parameters of the MOVITRAC
®
B frequency
inverter are listed in the MOVITRAC
®
B system manual. Each parameter is assigned a
specific number (index). 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 5
specify the data length in bytes. The data length for SEW frequency invert-
ers should be set to 4 bytes.
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Manage-
ment
Subindex
High index
Low index
MSB data
Data
LSB
LSB data
Parameter index
4-byte data
Byte 0: Management
data
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
00
I
Summary of Contents for Movitrac B
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