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Modbus properties

Use the MODBUS® properties to configure the mode of operation, master device settings, slave register settings, and remote and local IP port numbers.

You can use these parameters to configure the MODBUS properties.

Communication Interface

Select the type of communication interface the MODBUS blocks use for MODBUS TCP/IP communication.

Settings

Default: TCP/IP

Mode

Select the MODBUS mode of operation for the Simulink® model. This parameter also determines the type of blocks that can be used in the Simulink model. For example, in the Master mode, you can use only the Modbus TCP/IP Master Read and Modbus TCP/IP Master Write blocks. Similarly, in the Slave mode, you can use only the Modbus TCP/IP Slave Read and Modbus TCP/IP Slave Write blocks.

Settings

Default: Master

Slave

Remote Slave IP port number

Enter the IP port number of the master device connected on the TCP/IP network to successfully communicate between the master and slave devices. For example, if the remote slave device(s) are connected to port number 502, the master device must communicate only on this port with the slave device(s) for establishing a successful communication.

Note

Specify the same port number for the Remote Slave IP port number and Local IP port number parameters for the master and slave device(s) to communicate successfully.

Settings

Default: 502

Positive integer

Dependencies

To enable this parameter, set Mode to Master.

Local IP port number

Enter the IP port number of the slave device(s) connected on the TCP/IP network to successfully communicate between the master and slave device(s). For example, if the master is connected to port number 502, the slave device(s) must communicate only on this port with the master device for establishing a successful communication.

Note

Specify the same port number for the Remote Slave IP port number and Local IP port number parameters for the master and slave device(s) to communicate successfully.

Settings

Default: 502

Positive integer

Dependencies

To enable this parameter, set Mode to Slave.

Configure Coils

Select this parameter to configure the starting address and number of coil registers.

Settings

Default: Selected

Dependencies

To enable this parameter, set Mode to Slave.

Coil Register Parameters

ParameterDescriptionDefault Value
Start addressStarting address of the coil register. Dependencies: To enable this parameter, select Configure Coils.0
QuantityNumber of coil registers. Dependencies: To enable this parameter, select Configure Coils.1

Configure Discrete Inputs

Select this parameter to configure the starting address and number of discrete input registers.

Settings

Default: Selected

Dependencies

To enable this parameter, set Mode to Slave.

Discrete Input Register Parameters

ParameterDescriptionDefault Value
Start addressStarting address of the discrete input register. Dependencies: To enable this parameter, select Configure Discrete Inputs.0
QuantityNumber of discrete input registers. Dependencies: To enable this parameter, select Configure Discrete Inputs.1

Configure Holding registers

Select this parameter to configure the starting address and number of holding registers.

Settings

Default: Selected

Dependencies

To enable this parameter, set Mode to Slave.

Holding Register Parameters

ParameterDescriptionDefault Value
Start addressStarting address of the holding register. Dependencies: To enable this parameter, select Configure Holding registers.0
QuantityNumber of holding registers. Dependencies: To enable this parameter, select Configure Holding registers.1

Configure Input registers

Select this parameter to configure the starting address and number of input registers.

Settings

Default: Selected

Dependencies

To enable this parameter, set Mode to Slave.

Input Register Parameters

ParameterDescriptionDefault Value
Start addressStarting address of the input register. Dependencies: To enable this parameter, select Configure Input registers.0
QuantityNumber of input registers. Dependencies: To enable this parameter, select Configure Input registers.1

Received timeout (ms)

Enter the maximum time in milliseconds that the block should wait for a response from the MODBUS server. If the MODBUS server does not acknowledge the client within the specified time, then the communication is no longer valid.

Settings

Default: 100

Positive integer

Dependencies

To enable this parameter, set Mode to Master.