Product Short Description

Product Description

The ABB AO845 (Order No.: 3BSE045584R1) is a high‑precision analog output module designed for the ABB S800 I/O system, seamlessly integrating with AC800M controllers and the 800xA automation platform. It converts digital control commands into precise analog voltage or current signals to drive field devices such as control valves, variable frequency drives, actuators, and industrial transmitters. Engineered for reliability and accuracy, it supports both single and redundant system configurations, making it a cornerstone component in process automation and discrete manufacturing environments.
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ABB AO845 Analog Output Module
ABB AO845 Analog Output Module - Image 2

Description

Technical Specifications

Parameter Detail
Number of Channels 8 independent unipolar analog output channels
Signal Types Software‑selectable: 4–20 mA current; 0–10 V voltage
Resolution 12‑bit (4096 discrete steps)
Accuracy ≤ ±0.1% of full scale (FS), load‑dependent
Linearity Error ≤ 0.05% FS
Temperature Drift ≤ 50 ppm/°C
Output Load Capacity Current: Max 750 Ω; Voltage: Min 1 kΩ
Response Time Typical < 1 ms; Rise time (filter off): 23 ms
Update Cycle 10 ms
Isolation Groupwise isolated from ground (8 channels per group)
Insulation Voltage 50 V DC; Dielectric test: 500 V AC
Short‑Circuit Protection Current‑limited output (proof against short to ZP or +24 V)
Power Supply 24 V DC (external); +5 V via ModuleBus
Power Dissipation Typical 3.5 W; Max 5 W
Current Consumption +5 V: Max 125 mA; +24 V: 218 mA
Field Cable Length Max 600 m (656 yards)
Operating Temperature 0 °C to +55 °C (approvals for +5 °C to +55 °C); Storage: -40 °C to +70 °C
Storage Temperature -40 °C to +70 °C
Relative Humidity 5% to 95%, non‑condensing
Protection Class IP20 (indoor use only)
Pollution Degree Degree 2 (IEC 60664‑1)
Corrosion Resistance ISA‑S71.04: G3
EMC Compliance EN 61000‑6‑4, EN 61000‑6‑2
Safety Certifications CE, UL 61010‑1, EN 61010‑2‑201, IEC 61010‑1
Hazardous Area ATEX Zone 2, C1 Div2 cULus, C1 Zone2 cULus
Marine Certifications BV, DNV, LR
Dimensions (H×W×D) 119 mm × 45 mm × 102 mm (4.7 in × 1.77 in × 4.01 in)
Weight 0.21 kg (0.46 lbs)
Compatible MTUs TU810V1, TU812V1, TU814V1, TU830V1, TU833, TU842, TU843, TU852

Functional Features

  1. High‑Precision Signal Conversion

    Delivers stable 4–20 mA or 0–10 V signals with 12‑bit resolution and ≤ ±0.1% accuracy, ensuring consistent control of valves, pumps, and variable speed drives in critical processes.

  2. Redundant & Reliable Operation

    Supports redundant configuration for mission‑critical systems, with automatic fault detection and state reporting via the ModuleBus master to prevent downtime.

  3. Comprehensive Diagnostics

    Performs cyclic self‑checks to identify:

    • External Channel Errors (e.g., open circuit, low process supply)
    • Internal Channel Errors (e.g., incorrect output current)
    • Module Errors (e.g., short circuit, transistor failure, watchdog timeout)

      Front‑panel LEDs (Fault, Run, Warning, OSP) provide instant visual status.

  4. HART Pass‑Through Communication

    Enables bidirectional HART data transmission for field device configuration, calibration, and condition monitoring without interrupting the 4–20 mA control signal.

  5. Robust Electrical Protection

    Group‑to‑ground isolation minimizes cross‑talk and noise interference. Current‑limited outputs safeguard against short circuits to ZP or +24 V, enhancing system safety.

  6. Flexible Integration

    Works with all S800 I/O MTUs and fits standard DIN‑rail mounting. Compatible with major fieldbuses (Profibus DP, ControlNet, Ethernet/IP) via the host controller.

Application Scenarios

The AO845 is ideal for industries requiring precise analog control:
  • Process Industries: Oil & gas (flow control, compressors), power (boiler feed, turbine control), chemical (valve positioning, pH control), pharmaceuticals (precision dosing)
  • Manufacturing: Food & beverage (filling lines, pressure control), pulp & paper (tension control, speed regulation), metal processing (rolling mills, extruders)
  • Infrastructure & Special Environments: Water/wastewater (pump control, level regulation), marine (propulsion, winch control), mining (conveyors, hoists)
  • Critical Systems: Redundant process control, safety instrumented systems (SIS), high‑availability automation platforms

Key Advantages

  • High Accuracy & Stability: Ensures tight process control for quality consistency
  • Redundant Capability: Boosts system uptime for continuous operations
  • Integrated Diagnostics: Reduces maintenance time and troubleshooting complexity
  • HART Compatibility: Simplifies device management and reduces wiring costs
  • Robust Design: Withstands harsh industrial conditions, vibration, and EMC interference
  • Seamless S800 I/O Integration: Plug‑and‑play with ABB’s proven automation ecosystem

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