LB/FB remote I/O systems are designed to facilitate the connection of traditional input and output signals onto a bus network. The systems support general-purpose or intrinsically safe applications with modules that can be mixed and matched on the same backplane. They allow connection to Profibus DP, Modbus RTU and Modbus TCP for all traditional signal types, including discrete, analog, frequency and temperature. The interface gateways make the LB/FB conducive to system expansion or upgrade applications when access to specific fieldbus-enabled instruments is limited. Redundancy for the communication interface and power supply also ensures reliability.