Honeywell SC-UDIO01 28-Channel Mixed I/O Module | Replace Multiple Units With One PLC Expansion Module Lowest power consumption in its category at a typical 1.9W Temperature range -40 to 75°C (-40 to 167°F). Up to 75°C, not 70°C like other units High reliability with well-designed thermal paths HART enabled onboard I/O. No extra hardware required. Digital HART data & diagnostics are available locally for use in RTU program and remotely via HART IP HART-IP allowing remote