Operating Instructions – MOVITRAC® B
115
5
Communication and unit profile
Startup
The data length is 4 bytes for all parameters of SEW frequency inverters.
Using the WRITE service as an example, the following figure represents a process of
setting parameters between the controller and inverter using a cyclic PDU type. To sim-
plify the sequence, only the management byte of the parameter channel is shown here.
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
5947147915
0 110010
0
0 110010
0
0 110010
0
0 110010
0
0 110010
1
0 110010
0
0 110010
1
0 110010
0
0 110010
1
0 110010
1
0 110010
1
Controller
RS-485
Frequency inverter
(slave)
Parameter channel
is prepared
for write service.
.
Handshake bit is
changed and service
is passed to
frequency inverter
Service acknowlege
received because
send and receive
handshake bits are
now identical again.
Parameter channel is
received but not
evaluated.
Write service is executed,
handshake bit is
changed.
Write service
is processed
.
Parameter channel is
received but not
evaluated.
00
I
Summary of Contents for Movitrac B
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