10
11
2VV.
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7. CONTROL
MODBUS failure codes
Code Name
Meaning
01
Illegal function
The requested function is not supported by server
02
Illegal data address
The entered address is out of the range supported by server
03
Illegal data value
The transmitted data is not valid
04
Device failure
An unremovable failure occured while executing the request
05
Confirmation
Code intended for use at programming. The server reports the reception of a valid request but
the execution will take a longer timeu
06
Device is busy
Code intended for use at programming. The server is busy with executing a long-standing
command
08
Memory parity failure
Code intended for use at work with files. Server discovered a parity failure while trying to
read the file
Supported telegrams Modbus, Modbus Module*
MODBUS failure coder
Code Name
Meaning
03
READ HOLDING REGISTER
according to Modbus standard
04
READ INPUT REGISTER
according to Modbus standard
06
WRITE REGISTER
according to Modbus standard
16
WRITE MULTIPLE REGISTERS
according to Modbus standard
Examples of communication:
Operational data reading:
It is possible to read all operational data of the unit from addresses 15000 to 15008.
Example 1:
Start of the unit, flow rate 60%.
address → value
21000 → 0x01
21001 → 60 (max. flow rate = address 10002)
Turning off the unit:
21000 → 0x00
