Salicru CV30, Руководство пользователя, Страница: 118 / 140

118 - 140 Communication protocol
Code Name Meaning
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.
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: