Astraada DRV-24 frequency inverters Communication protocol
108
If there is one figure behind the radix point in the setting range or the default value, then the
fieldbus ratio value is 10. if the data received by the upper monitor is 50, then the “hibernation
restore delay time” is 5.0 (5.0=50÷10).
If Modbus communication is used to control the hibernation restore delay time as 5.0s. Firstly, 5.0
can be magnified by 10 times to integer 50 (32H) and then this data can be sent.
After the inverter receives the command, it will change 50 into 5 according to the fieldbus ratio
value and then set the hibernation restore delay time as 5s.
Another example, after the upper monitor sends the command of reading the parameter of
hibernation restore delay time ,if the response message of the inverter is as following:
Because the parameter data is 0032H (50) and 50 divided by 10 is 5, then the hibernation restore
delay time is 5s.
7.4.4 Fault message response
There may be fault in the communication control. For example, some parameter can only be read. If
a writing message is sent, the inverter will return a fault response message.
The fault message is from the inverter to the master, its code and meaning is as below:
Code
Name
Meaning
01H
Illegal
command
The command from master can not be executed. The
reason maybe:
1. This command is only for new version and this version
can not realize.
2. Slave is in fault state and can not execute it.
02H
Illegal data
address.
Some of the operation addresses are invalid or not
allowed to access. Especially the combination of the
register and the transmitting bytes are invalid.
03H
Illegal value
When there are invalid data in the message framed
received by slave.
Note: This error code does not indicate the data value to
write exceed the range, but indicate the message frame
is an illegal frame.
04H
Operation
failed
The parameter setting in parameter writing is invalid. For
example, the function input terminal can not be set
repeatedly.
05H
Password
error
The password written to the password check address is
not same as the password set by P7.00.
06H
Data frame
error
In the frame message sent by the upper monitor, the
length of the digital frame is incorrect or the counting of
CRC check bit in RTU is different from the lower monitor.
07H
Written not
allowed.
It only happen in write command, the reason maybe:
1. The written data exceeds the parameter range.
2. The parameter should not be modified now.
3. The terminal has already been used.
Summary of Contents for AS24DRV4075
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