Astraada DRV-24 frequency inverters Communication protocol
109
Code
Name
Meaning
08H
The
parameter
can not be
modified
during
running
The modified parameter in the writing of the upper
monitor can not be modified during running.
09H
Password
protection
When the upper monitor is writing or reading and the
user password is set without password unlocking, it will
report that the system is locked.
The slave uses functional code fields and fault addresses to indicate it is a normal response or some
error occurs (named as objection response). For normal responses, the slave shows corresponding
function codes, digital address or sub-function codes as the response. For objection responses, the
slave returns a code which equals the normal code, but the first byte is logic 1.
For example: when the master sends a message to the slave, requiring it to read a group of address
data of the inverter function codes, there will be following function codes:
0 0 0 0 0 0 1 1 (Hex 03H)
For normal responses, the slave responds the same codes, while for objection responses, it will
return:
1 0 0 0 0 0 1 1 (Hex 83H)
Besides the function codes modification for the objection fault, the slave will respond a byte of
abnormal code which defines the error reason.
When the master receives the response for the objection, in a typical processing, it will send the
message again or modify the corresponding order.
For example, set the “running command channel” of the inverter (P00.01, parameter address is
0001H) with the address of 01H to 03, the command is as following:
But the setting range of “running command channel” is 0~2, if it is set to 3, because the number is
beyond the range, the inverter will return fault response message as below:
Abnormal response code 86H means the abnormal response to writing command 06H; the fault
code is 04H. In the table above, its name is operation failed and its meaning is that the parameter
setting in parameter writing is invalid. For example, the function input terminal can not be set
repeatedly.
7.5 Example of writing and reading
Refer to section 7.3 for the command format.
7.5.1 Example of reading command 03H
Example 1: read the state word 1 of the inverter with the address of 01H (refer to table 1). From the
table 1, the parameter address of the state word 1 of the inverter is 2100H.
RTU mode:
The command sent to the inverter:
Summary of Contents for AS24DRV4075
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