Goodrive270 series VFD for fan and pump Communication protocol
-308-
VFD
address
Read
command
Parameter
data
CRC
2-byte
data
01 03 02 00 32 39 91
The parameter data is 0032H, that is, 50, and therefore 5.0 is obtained based on the fieldbus scale
(50/10=5.0). In this case, the master identifies that "Wake-up-from-sleep delay" is 5.0s.
9.4.6 Error message response
Operation errors may occur in communication-based control. For example, some parameters can
only be read, but a write command is sent. In this case, the VFD returns an error message response.
Error message responses are sent from the VFD to the master. The following table lists the codes and
definitions of the error message responses.
The command code received by the host controller is not allowed to
be executed. The possible causes are as follows:
• The function code is applicable only on new devices and is not
implemented on this device.
• The slave is in faulty state when processing this request.
For the VFD, the data address in the request of the upper computer is
not allowed. In particular, the combination of the register address and
the number of the to-be-sent bytes is invalid.
The received data domain contains a value that is not allowed. The
value indicates the error of the remaining structure in the combined
request. Note: It does not mean that the data item submitted for
storage in the register includes a value unexpected by the program.
The parameter is set to an invalid value in the write operation. For
example, a function input terminal cannot be set repeatedly.
The password entered in the password verification address is
different from that set in P07.00.
The data frame sent from the upper computer is incorrect in the
length, or in the RTU format, the value of the CRC check bit is
inconsistent with the CRC value calculated by the lower computer.
The parameter to be modified in the write operation of the upper
computer is a read-only parameter.
Parameter
cannot be
modified in
running
The parameter to be modified in the write operation of the upper
computer cannot be modified during the running of the VFD.
If the upper computer does not provide the correct password to unlock
the system to perform a read or write operation, the error of “system
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