MODBUS TCP establishes client/server communication. The only requirement is that the nodes are in the same IP address range.
An additional setting is made through the device address; however, this cannot be done manually on products from every manufacturer. For example, you can use the device address to reach the MODBUS RTU node connected to the Gateway by addressing the latter’s IP address via a MODBUS-TCP-MODBUS-RTU Gateway. Since 2007, MODBUS/TCP has been specified in the standard IEC 61158 and is referenced in IEC 61784-2 as CPF 15/1.