ABB UAA326A04 HIEE300024R4 Analog & Digital Hybrid I/O Module

UAA326A04 with part number HIEE300024R4 is a Swiss-manufactured rack-mounted hybrid I/O board dedicated to ABB UNITROL series generator excitation systems and legacy Advant MP200/MP300 DCS platforms. It integrates multi-channel analog signal acquisition and digital signal processing circuits, collecting generator voltage, current, winding temperature and breaker auxiliary contact signals, converting raw field signals into standardized digital data for excitation controller and DCS logic calculation.

This double-layer PCB plug-in module adopts full galvanic isolation design between field wiring and internal control circuits to counteract heavy electromagnetic interference in power station high-voltage switchgear rooms. Equipped with front panel LED fault indicators and built-in real-time self-diagnosis, it detects channel open-circuit, short-circuit and signal overflow. Original mass production has been phased out, serving as an essential aftermarket maintenance spare for thermal power, hydropower and heavy industry self-owned power plants.

Main Specifications

• Brand: ABB; Model: UAA326A04; Part No.: HIEE300024R4; Origin: Switzerland;In stock
• Applicable Systems: UNITROL Generator Excitation System, Advant MP200/MP300 DCS Control Platform
• Channel Configuration: Multi-channel analog input (4–20mA / 0–10V) + multi-channel digital DI/DO terminals
• Measurement Accuracy: ±0.1% full scale for standard industrial transmitter signals, 12-bit sampling resolution
• Isolation Standard: Reinforced galvanic isolation between field side and control backplane, anti-surge protection
• Operating Power: 24VDC auxiliary power supplied by cabinet rack backplane, max 0.5A power consumption
• Diagnosis Features: Per-channel status LED, fault alarm output for overload, open circuit and signal overflow
• Environmental Range: -20℃ ~ +70℃ operating temp, humidity 5%~95% non-condensing, high EMC immunity
• Installation Form: Standard single-slot Euro rack plug-in PCB, cabinet power-off required for replacement
• Matching Hardware: UNITROL1000 excitation controller, PM511 DCS CPU, SA9923A-E analog input module, FM9925A-E digital output board

Core Functions

• Continuously acquire analog measurement signals including generator stator voltage, rotor current, transformer oil temperature and bearing RTD converted 4–20mA signals.
• Collect digital binary signals from circuit breakers, isolating switches and cooling fan auxiliary contacts to realize equipment status interlock judgment for excitation control logic.
• Convert mixed analog and digital field signals into digital bus data and transmit to UNITROL excitation unit or Advant DCS controller via rack backplane for closed-loop voltage regulation and equipment protection.
• Built-in multi-stage hardware protection automatically cuts off abnormal channels when overload, short-circuit or signal overflow occurs, preventing board burnout without affecting other normal signal loops.
• Real-time self-test circuit uploads fault codes and abnormal channel information to upper HMI monitoring panel, supporting historical fault log storage for post-failure troubleshooting analysis.
• Standardized rack interface and consistent signal pin definition support direct ｄｒｏｐ-in replacement, no modification of cabinet wiring or control program logic during on-site overhaul.

Application Scenarios

• Spare hybrid I/O board replacement for UNITROL series synchronous generator excitation control cabinets in thermal power plants and hydropower stations.
• Process signal acquisition spare parts for boiler, turbine and generator control racks equipped with ABB Advant MP200/MP300 DCS systems.
• Maintenance backup inventory for petrochemical refineries, metallurgical steel mills and pulp & paper mill self-owned power station automation control cabinets.
• Matching signal interface module cooperating with ABB PM511 DCS CPU, SA9923A-E analog input card and FM9925A-E digital output module.
• Overhaul and retrofit spare components for cement kiln, biomass waste heat power station and mining auxiliary power generation excitation control systems.

• Global aftermarket spare stock for energy industry maintenance workshops servicing vintage ABB excitation and DCS automation hardware.