Kruger Ecowatt K320 Series Operation Manual page 302

Ecowatt Drive K320 series
®
Code Name
Data frame
06H
error
Parameter
07H
read-only
Parameter
cannot be
08H
modified in
running
Password
09H
protection
When returning a response, the slave device uses a function code domain and fault address to
indicate whether it is a normal response (no error) or exception response (some errors occur).
In a normal response, the device returns the corresponding function code and data address or
sub-function code. In an exception response, the device returns a code that is equal to a
normal code, but the first bit is logic 1.
For example, if the master device transmits a request message to a slave device for reading a
group of function code address data, the code is generated as follows:
For an exception response, the following code is returned:
In addition to the modification of the code, the slave device returns a byte of exception code
that describes the cause of the exception. After receiving the exception response, the typical
processing of the master device is to transmit the request message again or modify the
command based on the fault information.
For example, to set the "Channel of running commands" (P00.01, the parameter address is
0001H) of the VFD whose address is 01H to 03, the command is as follows:
01
VFD
address
However, the setting range of the "Running command channel" is 0 to 2. The value 3 exceeds
the setting range. In this case, the VFD returns an error message response as shown in the
following:
The length of the data frame transmitted by the upper computer is
incorrect, 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.
The parameter to be modified in the write operation of the upper
computer cannot be modified during the running of the VFD.
A user password is set, and the upper computer does not provide
the password to unlock the system when performing a read or
write operation. The error of "system locked" is reported.
0 0 0 0 0 0 1 1 (03H in the hexadecimal form)
1 0 0 0 0 0 1 1 (83H in the hexadecimal form)
06 00 01
Write Parameter
address
command
Description
00 03
Parameter
data
-293-
Communication
98 0B
CRC