AVEVA™ Plant SCADA

Generic MODBUS TCP/IP Devices - Communication Settings

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Generic MODBUS TCP/IP Devices - Communication Settings

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Last UpdatedJul 08, 2025
2 minute read

The following tables show the settings for communication with Generic MODBUS TCP/IP Devices. To establish communication with a device, configure the Boards, Ports and I/O Devices settings in Plant SCADA Studio's Topology activity correctly. If you use the Express Communications Wizard to connect to a device, these will be automatically configured for you. However, if you need to configure them manually, or verify that the fields are correct, use the settings outlined below.

Boards

Field	Value
Board Type	Enter TCPIP .
Address	Enter 0 .
I/O Port	Leave this field blank .
Interrupt	Leave this field blank.
Special Options	Leave this field blank.

Ports

Field	Value
Port Number	A valid unique number.
Baud Rate	Leave this field blank.
Data Bits	Leave this field blank.
Stop Bits	Leave this field blank.
Parity	Leave this field blank.
Special Options	Enter the destination IP address of the PLC. Use the following format: -Ia -Pn -T where: a = the IP address in standard Internet dot format. (For example 192.9.2.60) n = the destination Port number. Often one physical port has several virtual ports, used for different purposes. Use this option only if you want to override the default of 502. -T = forces the driver to use TCP, rather than UDP (-U).

I/O Devices

Field	Value
I/O Device Address	If the connection to the I/O device is point-to-point using TCP/IP, leave this field blank to assign a default value of 0. Or, you can specify the slave address if the device requires it. If the connection to the I/O device is through MODBUS/TCP to MODBUS serial line gateway, use the slave address of I/O device. Note: To enable broadcast through MODBUS/TCP to MODBUS serial line gateway, an I/O device should be created with address value 0. All the broadcast requests should be sent to this I/O device. Refer to the Broadcast and BroadcastDelay parameters for details (see MODNET Driver Parameters).
I/O Device Protocol	Enter the MODNET protocol variant. (See MODNET Protocol Variants to determine which variant is required.)

Field

Value

I/O Device Address

If the connection to the I/O device is point-to-point using TCP/IP, leave this field blank to assign a default value of 0. Or, you can specify the slave address if the device requires it.

If the connection to the I/O device is through MODBUS/TCP to MODBUS serial line gateway, use the slave address of I/O device.

Note: To enable broadcast through MODBUS/TCP to MODBUS serial line gateway, an I/O device should be created with address value 0. All the broadcast requests should be sent to this I/O device. Refer to the Broadcast and BroadcastDelay parameters for details (see MODNET Driver Parameters).

I/O Device Protocol

Enter the MODNET protocol variant.

(See MODNET Protocol Variants to determine which variant is required.)

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