The high voltage input can be programmed to power up in either voltage mode or current mode. When programmed in current mode, the unique input circuit architecture provides a path for the loop current, even in the absence of the system module power supply. The AD4110-1 provides internal, front-end diagnostic functions to indicate overvoltage, Undervoltage, open wire, overcurrent, and overtemperature conditions. The high voltage input is thermally protected, overcurrent limited, and overvoltage protected. The AD4110-1 incorporates a precision 24-bit, Σ-Δ, analog-to-digital converter (ADC) offering conversion rates from 5SPS to 125kSPS with simultaneous 50Hz and 60Hz noise rejection.