This reference design is a four channel-to-channel: isolated 4–20 mA: current-loop analog input module. The design includes a short circuit: overcurrent: and overvoltage limit function for condition monitoring sensor and module applications. The major features of this analog input module include channel isolation: a multi-channel analog input module powered up by a single flyback converter using LM5180 device: a power supply to 2-wire transmitter and short-circuit protection circuit. This design can also support a four-channel analog input module.