2VV IC-ModBus Kurulum ve Servis Kılavuzu - Sayfa 11

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7. CONTROL

Code

Name

Illegal function

Illegal data address

Illegal data value

Device failure

Confirmation

Device is busy

Memory parity failure

Supported telegrams Modbus, Modbus Module*

Code

Name

READ HOLDING REGISTER

READ INPUT REGISTER

WRITE REGISTER

WRITE MULTIPLE REGISTERS

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

MODBUS failure codes

Meaning

The requested function is not supported by server

The entered address is out of the range supported by server

The transmitted data is not valid

An unremovable failure occured while executing the request

Code intended for use at programming. The server reports the reception of a valid request but

the execution will take a longer timeu

Code intended for use at programming. The server is busy with executing a long-standing

command

Code intended for use at work with files. Server discovered a parity failure while trying to

read the file

MODBUS failure coder

Meaning

according to Modbus standard

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