Hitachi ADAX3 Modules ADAX3-04LL2

Technical Dossier

Product Details And Specifications

Hitachi ADAX3 Series Technical Notes

The Hitachi ADAX3 series represents a core I/O and signal processing module family within Hitachi's distributed control system (DCS) architecture, deployed extensively across global heavy industries including petrochemical refineries, nuclear power generation facilities, chemical processing plants, and steel manufacturing complexes. These modules operate as integral components of Hitachi's HISEC and HIACS control platforms, providing deterministic signal conditioning, digital I/O management, and inter-subsystem communication in environments where continuous uptime is a non-negotiable operational requirement. The installed base of ADAX3-series hardware spans multiple decades of industrial infrastructure, making long-term spare parts availability a critical procurement concern for plant maintenance engineers worldwide.

ADAX3 Full Catalog & Functionalities (SKU List)

The following SKUs represent confirmed modules within the Hitachi ADAX3 series, classified by functional category. Each entry reflects a discrete hardware unit with a defined role within the DCS backplane architecture.

Digital Signal Processing / Analog Input Modules

• ADAX3-04LL2: 4-channel low-level analog input module with differential signal conditioning for thermocouple and RTD inputs.
• ADAX3-04HL2: 4-channel high-level analog input module; 4–20 mA / 0–10 V process signal acquisition.
• ADAX3-08LL2: 8-channel low-level analog input; expanded channel density for multi-sensor process loops.
• ADAX3-08HL2: 8-channel high-level analog input; standard process variable acquisition for flow, pressure, and level transmitters.
• ADAX3-04LL4: 4-channel low-level analog input with 16-bit resolution; enhanced accuracy for precision measurement loops.

Analog Output Modules

• ADAX3-04AO2: 4-channel analog output module; 4–20 mA current loop output for control valve and actuator positioning.
• ADAX3-08AO2: 8-channel analog output; high-density current output for multi-loop control applications.
• ADAX3-04AO4: 4-channel analog output with 16-bit DAC resolution; precision output for servo and modulating control.

Digital Input Modules

• ADAX3-16DI2: 16-channel 24 VDC digital input module; discrete status acquisition for field switches and proximity sensors.
• ADAX3-32DI2: 32-channel 24 VDC digital input; high-density discrete input for large-scale I/O marshalling panels.
• ADAX3-16DI4: 16-channel isolated digital input; galvanic isolation for high-noise industrial environments.

Digital Output Modules

• ADAX3-16DO2: 16-channel 24 VDC digital output; relay-driven discrete output for solenoid valves and motor starters.
• ADAX3-32DO2: 32-channel 24 VDC digital output; high-density discrete output for large marshalling applications.
• ADAX3-16DO4: 16-channel isolated digital output; optically isolated outputs for safety-critical switching circuits.

Communication & Interface Modules

• ADAX3-COM1: RS-232/RS-485 serial communication adapter; legacy field device integration and MODBUS RTU support.
• ADAX3-COM2: Ethernet communication module; TCP/IP connectivity for supervisory data acquisition and remote diagnostics.
• ADAX3-BUS1: Backplane bus extender module; enables multi-rack expansion within a single DCS node.

Power Supply Modules

• ADAX3-PS24: 24 VDC rack power supply module; primary power distribution for ADAX3 backplane assemblies.
• ADAX3-PS48: 48 VDC power supply variant; for installations with higher rail voltage requirements.