Part Code Definition

1C31xxx = Ovation standard remote I/O personality module series

194 = exclusive model code for valve positioner HART output special card

G03 = third generation hardware revision version

Technical Specifications

Backplane powered via rack internal 5VDC bus;

4 independent galvanic isolated HART analog output channels, fixed output signal:4~20mA DC with superimposed HART digital communication signal;

Single channel max loop load impedance ≤550Ω, built-in loop short-circuit & open-circuit detection;

D/A conversion resolution:14bit, full-scale output precision ≤±0.12% at 25℃;

Channel-to-backplane isolation voltage:1500VAC dielectric withstand;

Working ambient: -40℃~+70℃, 5%~90%RH non-condensing; supports hot-swap on standard Ovation I/O rack; net weight approx 0.38kg.

Interface & Communication Layout

Rear gold finger connects matched base module to realize Ovation backplane bus data interaction;

Front terminal block for field smart positioner shielded twisted-pair wiring;

Front panel LED indicators including RUN operating lamp, module fault alarm, individual channel communication status & loop fault indication;

Embedded HART physical layer circuit to realize bidirectional digital data exchange with field HART valve positioner.

Core Functions

Digital-to-analog conversion + HART superposition to output positioning command for Fisher/Emerson smart valve positioner;

Real-time collection of valve travel feedback via HART to complete closed-loop positioning regulation inside DCS;

Per-channel independent loop fault diagnosis (open circuit, short circuit, positioner offline), single-channel failure no impact on remaining channels;

Online parameter configuration, positioner calibration and equipment fault diagnosis via Ovation system software through HART bus;

Automatic fault information upload to Ovation host controller for system alarming and recording.

Application Scenarios

Boiler feedwater control valve, steam temperature attemperator regulating valve, furnace air/wind damper smart actuator control in thermal power plants; refining pipeline pressure/flow regulating valve closed-loop control for petrochemical DCS system spare replacement and I/O expansion.

Operation & Maintenance Notes

Field signal cable uses shielded twisted pair with single-end shielding grounded inside control cabinet;

Separate HART analog wiring from high-power AC power cable to eliminate EMI interference;

Regular maintenance checks terminal tightness, loop current value and HART communication online status; replace module if persistent channel communication failure occurs after field circuit inspection.