Savch S2800 Series, User Manual

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Parameters read from inverter are all expressed in hexadecimal system. All values = actual
value*10K, of which K is the bit number after decimal point of parameter.
M. Response of Wrong Information
It uses function code field and fault address to indicate normal response (right) or there are some
errors ( called objection response). As for the normal response, the corresponding function code,
data address or sub-function code are responded from equipment. For the objection response,
return to one code equals to normal code from equipment. But the first position must be logical 1.
For example, the information sent from a host to assistant requires to read a group of data of
inverter function code address, the following function codes will be produced:
0 0 0 0 0 0 1 1 (hexadecimal 03H)
For the normal response, the assistant equipment responds the same function code. And the
objection response, it returns:
1 0 0 0 0 0 1 1 (hexadecimal 83H)
The assistant equipment will respond one byte of abnormal code except that the function has
been modified due to objection error, which is the reason of abnormal codes.
Once received the objected response, the typical processing of application program of host
equipment is resending message, or modify command aiming at corresponding errors.
Meaning of Error Code
ModBus Abnormal Code
Code Name Meaning
01H
02H
03H
06H
10H
11H
12H
13H
When the function code received by host is forbidden operation; or assistant
processes this demanding in error condition
The demanding data address from host is forbidden address, especially when
the combination of register address and transmitted bytes is invalid.
When the received data field includes forbidden value. Note: it doesn’t mean that
the data presented and stored has a value excepted of application program.
Inverter is busy. (EPPROM is being saved)
The password written in by password check address is different from the 08-00
user password.
In the frame information sent by host computer, when RTU format CRC check bit
or ASCII format LRC check bit is different from the check calculation value of
assistant computer, the information of check error is sent out.
In parameter writing command sent by host computer, the sent data that out of
parameter range or the write address is unable to alter currently.
When the host computer reads or writes, the user password has been set and the
computer hasn’t released the password protection, and the system will be locked.
Illegal
function
Illegal data
address
Illegal data
value
Assistant
unit busy
Password
incorrect
Check
incorrect
Parameter
alter invalid
System
locked