Operating Instructions – MOVITRAC® B
113
5
Communication and unit profile
Startup
Reading a parame-
ter cyclically
For the cyclic transmission method, the handshake bit has to be changed to activate ser-
vice processing (execution of read service). When using acyclic PDU types, every in-
verter processes every request telegram and in this way always executes the parameter
channel.
Parameters are set as follows:
1. Enter the index of the parameter to be read in byte 2 (index high) and byte 3 (index
low).
2. Enter the service identifier for the READ service in the management byte (byte 0).
3. In cyclical PDU types, you transfer the read service to the inverter only by changing
the handshake bit. In acyclical PDU types, the parameter channel is always evalu-
ated.
Since this is a read service, the sent data bytes (bytes 4 - 7) and the data length (in the
management byte) are ignored and do not need to be set.
The inverter now processes the read service and sends the service confirmation back
by setting the handshake bit to an equal value.
Byte 0: Management
7
6
5
4
3
2
1
0
0
0/1
1
1
0
0
0
1
Service identifier:
0001 = Read
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
X = Not relevant
0/1 = Value of the bit changes
00
I
Summary of Contents for Movitrac B
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