Modbus over TCP/IP Data Exchange

Connection Example

List of Supported

Function Codes

and Their

Descriptions

The following table lists the function codes that can be used by Modbus over TCP/ IP masters that communicate with the STB NIP 2212:

Modbus	Subfunction	Hexadecimal	Description
Function	or Subindex
Code

3		0x03	read output holding registers (4x)

4		0x04	read input registers (3x)

6		0x06	write single register (4x)

8	sub index 21	0x08	get/clear Ethernet statistics (See Ethernet
			Statistics, p. 136)

16		0x10	write multiple (output) registers (4x)

22		0x16	mask write registers (4x)

23		0x17	read/write multiple registers (4x)

The following table describes the general process used by Modbus over TCP/IP masters to exchange data with the STB NIP 2212.

Stage

Action

1Execute a function, specify the function code and the register address of the selected input or output channel.

2The Modbus master (i.e., PC, PLC) sends a request to the STB NIP 2212.

If no exception is returned, the STB NIP 2212 responds to the master by

sending the data that was requested.

If a request contains an error, the STB NIP 2212 returns an exception code to the master.

List of Exception The following table describes the exception codes that Modbus over TCP/IP uses to

Codes	indicate an error condition:

	Code in Hexadecimal	Description

	0x01	illegal function

	0x02	illegal data address

	0x03	illegal data value

	0x04	slave device failure

148	890USE17700 April 2004

890USE17700 specifications

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Schneider Electric 890USE17700 List of Supported Function Codes Their Descriptions, Statistics, p

Models: 890USE17700

List of Supported

Function Codes

and Their

Descriptions

Statistics, p. 136)