Emerson KJ3008X1-BA1 12P2293X052 DeltaV

The VIMNet Server configuration correlates each unique Modbus address with an IP address. At the simplest level, each Modbus device equates to an IP address. In some cases, a single IP address may also be mapped to more than one Modbus device, as is typically required when interfacing with Motor Control Centers. In this case, the IP address mapped belongs to a gateway device, which in turn acts as a data concentrator communicating with multiple actual Modbus devices, each with a unique address.

The gateway device typically communicates serially with its slaves. For example, a Modbus Ethernet Bridge manufactured by Schneider Electric (part # 174CEV30020) is such a device. This is a network device that communicates via ModbusTCP with the VIM. The message packets are converted to standard Modbus and serially transmitted over RS-232 or RS-485 to slave devices. The subsequent responses are converted and transmitted to the VIM via ModbusTCP. Because of the serial communications (maximum baud rate of 19.2k), you can expect message times of 1-2 seconds.