The Unitronics Model UIA-0402N UniStream® Analog I/O Expansion Module (Hardware Description: UniStream IO, 4AI, 2AO, NO ISO, 24V), engineered and manufactured by Unitronics Ltd. in Airport City, Israel, is a high-accuracy mixed-signal analog expansion slice designed for the UniStream® enterprise automation platform.

Modular Uni-I/O™ Interconnection Architecture:
Belonging to the standardized Uni-I/O™ family, the UIA-0402N module delivers maximum configuration versatility across industrial electrical cabinets:
- Direct CPU-Docked Mounting: Snaps directly into the side communication bus of a UniStream CPU-for-Panel (such as model USC-P-B10 attached behind the USP-156-B10 display) or a stand-alone UniStream PLC controller.
- Distributed DIN-Rail Deployment: Utilizing a Local Expansion Kit (UAG-XKxxx series), modules can be situated remotely across standard 35 mm DIN rails inside the enclosure, optimizing wiring pathways from field sensors.
- Pluggable Terminal Connectors: Utilizes high-density detachable screw terminal blocks (Euro-block style) that streamline pre-wiring and facilitate rapid replacement without disturbing field wiring looms.

Model Code Breakdown & Configuration (UIA-0402N):
- UIA: UniStream Uni-I/O Analog module series.
- 04: Features 4 multi-range Analog Inputs (AI).
- 02: Features 2 multi-range Analog Outputs (AO).
- N: Non-isolated architecture (signal channels share a common 0V reference with the instrument power supply), providing an economical hardware footprint for control enclosures with stable 24VDC power distribution and consolidated common grounding.

Key Engineering Features & Operational Advantages:
- 4 Multi-Range Analog Inputs: Software-configurable within the programming environment to ingest 0-10 VDC voltage or 0-20 mA / 4-20 mA current loops without adjusting internal physical jumpers. Delivers high conversion resolution (up to 13-bit for 0-10V / 0-20mA and 14-bit for 4-20mA) for precise measurement of pressure, level, and flow dynamics.
- 2 Precision 12-Bit Analog Outputs: Produces smooth 0-10 VDC or 0/4-20 mA analog telemetry loops, ideal for modulating pneumatic control valves, variable frequency drive velocity references, and motorized dampers.
- Comprehensive Channel Status & Diagnostic LEDs: The front housing integrates status indicator LEDs displaying system run status alongside individual per-channel indicators alerting to out-of-range signal conditions (Underflow / Overflow) and broken wire faults.
- Unified Software Integration in UniLogic™: Dragging and dropping the UIA-0402N module into the hardware configuration automatically instantiates structured global tags. Built-in linearization function blocks eliminate manual algebraic programming, reducing control loop engineering time by up to 70%.

Target Industrial Sectors & Applications:
- Municipal & Industrial Water Treatment: Monitoring differential filter pressure, clarifier liquid levels, and electromagnetic flowmeters; throttling chemical dosing pump speeds and sludge wasting valves.
- Food, Beverage & Dairy Processing: Pasteurizer temperature and pressure logging, vacuum cooking vessel modulation, syrup metering, and continuous bottling speed control.
- Steam Boilers & Heat Recovery: Steam drum pressure telemetry, superheater temperature monitoring, continuous boiler feedwater valve control, and combustion air damper modulation.
- Plastics, Rubber & Die-Casting: Tracking injection barrel melt pressures and hydraulic pump delivery; controlling proportional throttling valves on hydraulic skids.
- Building Automation & Central Utilities (HVAC): Supply/return chilled water temperature sensing, AHU filter differential pressure monitoring, and 2-way/3-way proportional water valve positioning.

• Manufacturer: Unitronics (Unitronics Ltd.)
• Country of Origin: 100% Israel (Made in Israel)
• Product Line: UniStream® Uni-I/O™ Analog Expansion Modules
• Model Designation: UIA-0402N
• Module Topology: 4 Analog Inputs, 2 Analog Outputs, Non-isolated (NO ISO)
• Host System Compatibility: Mounts directly to UniStream CPU-for-Panel, stand-alone UniStream PLC, or via Local Expansion Adapters (UAG-XKxxx)
• ANALOG INPUTS (4 CHANNELS):
  - Number of Inputs: 4 single-ended channels (referenced to common 0V)
  - Configurable Signal Types:
    + Voltage Range: 0 to 10 VDC (Input impedance > 200 kΩ)
    + Current Ranges: 0 to 20 mA or 4 to 20 mA (Input impedance 249 Ω)
  - A/D Conversion Resolution:
    + 0 - 10 VDC & 0 - 20 mA: 13-bit (0 to 8191 raw counts)
    + 4 - 20 mA: 14-bit (1638 to 8191 raw counts)
  - Measurement Accuracy: ±0.3% of Full Scale at 25°C; ±0.5% of Full Scale across operating temperature range
  - Conversion Cycle Time: 10 ms for all configured channels
• ANALOG OUTPUTS (2 CHANNELS):
  - Number of Outputs: 2 channels
  - Output Signal Types:
    + Voltage Mode: 0 to 10 VDC (Minimum resistive load 1 kΩ)
    + Current Modes: 0 to 20 mA or 4 to 20 mA (Maximum resistive load 500 Ω)
  - D/A Conversion Resolution: 12-bit (0 to 4095 raw counts)
  - Output Accuracy: ±0.3% of Full Scale at 25°C; ±0.5% of Full Scale across operating temperature range
  - Output Update Rate: 5 ms
• ISOLATION & POWER CHARACTERISTICS:
  - Galvanic Isolation: Non-isolated (inputs/outputs share internal system 0V reference)
  - Nominal Operating Power Supply: 24 VDC (Permissible range 20.4 to 28.8 VDC)
  - Nominal Power Consumption: Approx. 2.5 W @ 24 VDC
• STATUS INDICATION & FIELD TERMINATION:
  - Diagnostic LEDs: Module status LED plus individual channel fault/status indicators
  - Terminal Block Interface: Pluggable Euro-block screw terminal connectors (3.5 mm pitch)
  - Wire Sizing Compatibility: 28 to 16 AWG (0.08 mm² to 1.31 mm²)
• MECHANICAL & ENVIRONMENTAL:
  - Housing Material: Industrial flame-retardant polyamide thermoplastic
  - Ingress Protection: IP20 conforming to IEC 60529
  - Mounting Profile: Direct CPU docking or 35 mm DIN-rail mounting via expansion adapter
  - Module Dimensions (W x H x D): 24.3 x 90 x 107 mm (0.95” x 3.54” x 4.21”)
  - Net Weight: Approx. 130 g (4.58 oz)
  - Operating Ambient Temperature: -20°C to +55°C (-4°F to +131°F)
  - Relative Humidity: 5% to 95% RH (non-condensing)
• Development Environment: Unitronics UniLogic™ Studio (License-free suite)
• Compliance & Certifications: CE marked, cULus Listed, RoHS compliant, ISO 9001 certified.