Modbus TCP/IP Server Write

Server device writes data to server device register over TCP/IP network

• 

Libraries:
Raspberry Pi Blockset / Network

Description

In the Modbus TCP/IP Server Write block, the server device writes data to its registers. The server can write data to only one register per read operation.

Raspberry Pi^® Blockset supports the Modbus^® communication protocol over the TCP/IP network.

The server can perform read and write operation on these server register(s).

Register Type	Register Size
Coil	1-bit
Discrete Input	1-bit
Holding Register	16-bit
Input Register	16-bit

Note

To generate code C/C++ code for this block, you must have an Embedded Coder^® license.

Examples

MODBUS TCP/IP Communication Between Client and Server Devices Using Raspberry Pi Hardware

Use Raspberry Pi® Blockset to implement MODBUS® TCP/IP communication between MODBUS client and server devices. It also shows how to communicate between the two devices in four modes of operation, Client Read, Client Write, Server Read, and Server Write.

• Open Model

Ports

Input

Input — Input data

scalar

The input to the block is the data that the server writes to its registers as a 1-bit scalar.

• If you select the Coil or Discrete Input write operations, the server writes data to its registers as a 1-bit write operation as Boolean data.

• If you select the Holding Register or Input Register write operations, the server writes data to its registers as a 16-bit write operation as uint16 data.

Data Types: Boolean | uint16

Parameters

Function — Type of write operation

Write Coil (default) | Write Discrete Input | Write Holding register | Write Input register

Select the type of write operation you want to perform on the server register. Specify any one of the following:

• Write Coil: Write data to the coil register address specified in the Coil Address parameter.

• Write Discrete Input: Write data to the discrete input register address specified in the Discrete Input Address parameter.

• Write Holding register: Write data to the holding register address specified in the Holding Register Address parameter.

• Write Input register: Write data to the input register address specified in the Input Register Address parameter.

Coil Address — Address of coil register

0 (default) | scalar

To notify the server to write data to a specific coil register, specify the coil register address in this parameter. For example, for the server to write data to the coil register with the address 10, enter 10.

Dependencies

To enable this parameter, set Function to Write Coil.

Discrete Input Address — Address of discrete input register

0 (default) | scalar

To notify the server to write data to a specific discrete input register, specify the discrete input register address in this parameter. For example, for the server to write data to the discrete input register with the address 80, enter 80.

Dependencies

To enable this parameter, set Function to Write Discrete Input.

Holding Register Address — Address of holding register

0 (default) | scalar

To notify the server to write data to a specific holding register, specify the holding register address in this parameter. For example, for the server to write data to the holding register with the address 37, enter 37.

Dependencies

To enable this parameter, set Function to Write Holding register.

Input Register Address — Address of input register

0 (default) | scalar

To notify the server to write data to a specific input register, specify the input register address in this parameter. For example, for the server to write data to the input register with the address 25, enter 25.

Dependencies

To enable this parameter, set Function to Write Input register.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

To generate code C/C++ code for this block, you must have an Embedded Coder license. For more information on selecting the right product stack according to your development goals, see Product Stack for Raspberry Pi Blockset.

Version History

Introduced in R2021a