ModbusTCP Client (Master)

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Error handlingET/MT-3x6, ET/MT-2x8 series error messagesError Messages of Individual DriversModbusTCP Client (Master)

 

The part supplementary data of error messages of Modbus TCP Master driver may contain following data:

 

 

data_address is the start address of data accessed by the request in the Modbus address notation
data_size is the size of data accessed by the request  expressed like a number of data elements in decimal format.
direction (from the point of view of the terminal) is:

- "rcv" for transmitting data from the slave to the master

- "snd" for transmitting data from the master to the slave

exception_code is the exception response code in hexadecimal format
error_code is the decimal error code value returned by an RTIP API function
IP_address is the IP address of the accessed slave in format xxx.xxx.xxx.xxx
unit is the decimal unit identifier of the accessed slave

 

The Modbus Modicon and Modbus general address notations are like this:

 

- <address_type> <address>

 

address_type may be one of:

- 0,O,M

- 1,I

- 3

- 4,R

address is an unsigned number in decimal format

 

The Modbus ABB address notation is like this:

 

- <address_type>  <group>,<channel>

 

address_type may be one of: E, A, M, EW, AW, MW, KW, MD, KD
group is an unsigned number in decimal format
channel is an unsigned number in decimal format

 

 

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