AO810 AO810V2 3BSE038415R1 ABB S800 I/O 8Ch Analog Output Module

AO810 AO810V2 3BSE038415R1 ABB S800 I/O Analog Output Module Overview

The ABB AO810 (Article 3BSE038415R1) is an 8-channel unipolar analog output module belonging to the S800 I/O architecture. It converts digital controller values into 0...20 mA or 4...20 mA current signals to drive field actuators. Serial data transmission to the internal D/A converters is continuously read back and verified to guarantee output signal integrity. Built-in Output Set Speed / Output Position (OSP) functionality drives process loops to predefined fail-safe states upon loss of communication.

Technical Specifications

• Brand & Series: ABB S800 I/O
• Model & Article Code: AO810 / AO810V2 (Part Number: 3BSE038415R1)
• Channel Count & Signal Type: 8 unipolar current channels, 0...20 mA, 4...20 mA
• Digital Resolution: 14 Bit high-precision conversion
• Permissible Output Load: ≤ 500 Ω (L1+ supply mode); 250...850 Ω (L2+ supply mode)
• Dynamic Response Time: ≤ 2 ms update cycle; 0.35 ms rise time at 500 Ω load
• Conversion Accuracy & Drift: Max error 0.1% (0-500 Ω); Temperature drift 30 ppm/°C typical, 60 ppm/°C maximum
• Isolation Protection: Groupwise isolation from ground with 50 V rated insulation and 500 V a.c. dielectric withstand test
• Power Dissipation & Current Demand: 2.3 W dissipation; 70 mA at +5 V d.c. Modulebus; 245 mA external +24 V d.c. demand
• Field Protection Circuitry: Short-circuit proof current limiting output to ZP or +24 V d.c.

Target Equipment and Application Scenarios

The AO810 analog output module is specified for precise closed-loop control across critical process industries, including:

• Control Valve Actuation: Modulating 4-20 mA pneumatic positioners and variable flow control valves in chemical refineries and power plants.
• Variable Frequency Drives (VFDs): Delivering smooth speed reference current signals to high-power motor drives and pump skids.
• Damper & Position Controls: Regulating airflow and exhaust dampers in industrial HVAC and boiler combustion systems.
• Fail-Safe Process Loops: Utilizing hardware-configured OSP fallback values to safely park field devices during controller reboot cycles.

Installation Guide

Align keying code AE on the AO810 module with the target Module Termination Unit before insertion. Press the housing squarely onto the MTU until mechanical locks click into position. Verify external +24 V d.c. supply connections across L1+ or L2+ terminals according to your target loop resistance requirements. Keep total field cable lengths below 600 meters (656 yards). Ensure free vertical cabinet air circulation when ambient temperatures exceed 40 °C in compact MTU installations.

Advanced Diagnostic Capabilities

Integrated self-diagnostics execute cyclically on the AO810 to safeguard process loops without external monitoring hardware. Four front-panel LEDs provide status feedback: Fault (F), Run (R), Warning (W), and OSP status (O).

• Communication Read-Back Verification: Serial data written to internal D/A converters is immediately read back to verify data validity.
• Process Power Supply Supervision: Continuous hardware monitoring triggers a Module Error code if external 24 V d.c. loop power drops below safe operating limits.
• Active Channel Open-Circuit Detection: Automatically flags a Channel Error if actual loop output current drops below setpoint on active channels outputting greater than 1 mA.

Compatibility Overview

The AO810 seamlessly mounts onto standard S800 single termination units:

• Matching MTU Base: TU810V1
• Compatible MTU Models: TU810, TU812, TU814, TU830, TU833
• Protocol Isolation: Non-HART module for direct 0-20 mA and 4-20 mA current outputs

Certifications and Industrial Compliance

The ABB AO810 conforms to severe industrial hardware standards: Electrical safety ratings per EN 61010-1 and UL 61010-2-201. Hazardous location compliance covers Class 1 Division 2 cULus, Class 1 Zone 2 cULus, and ATEX Zone 2. Marine classification society approvals include ABS, BV, DNV, and LR. Environmental robustness is rated ISA-S71.04 G3 for harsh corrosive atmosphere protection, with full compliance under RoHS DIRECTIVE/2011/65/EU and WEEE standards.

Package Contents, Warranty, and Logistics

• Contents: 1 x Factory-Sealed ABB AO810 Analog Output Module (Article 3BSE038415R1)
• Warranty Terms: Backed by a full 12-Month hardware replacement warranty from date of dispatch
• Logistics Expediting: Shipped within 24 to 48 hours via top-tier express carriers including FedEx, UPS, and DHL

Global PLC Spare HUB's Insight

A common field troubleshooting issue with the AO810 involves unexpected "Channel Error" trips on high-impedance valve positioners. Field engineers often forget that the total loop load resistance dictates the terminal wiring strategy on the MTU. Wiring the external 24 V power supply to terminal L1+ limits maximum allowable loop impedance to 500 Ω. If your field positioner and cable loop resistance exceeds 500 Ω (up to 850 Ω), you must connect the process supply to terminal L2+ instead. Selecting L2+ boosts internal voltage headroom, preventing false open-circuit diagnostic triggers on high-resistance loops.

Selection Guide and Technical FAQ

Selection Tip: Select the AO810 for standard 14-bit, 8-channel analog current outputs where HART digital pass-through is not required. If your smart positioners or field instruments require HART protocol pass-through communication, choose the AO845 HART output module within the S800 I/O product family.

Question: How does the OSP (Output Set Speed) function behave when controller communications fail?

Answer: When a Modulebus communication interruption is detected, the front OSP LED illuminates, and the module instantly forces all 8 channels to user-preconfigured fail-safe current values (such as 0 mA, 4 mA, or hold last value) to prevent uncontrolled plant states.

Question: What causes an open-circuit channel diagnostic error on the AO810?

Answer: The module triggers a Channel Error when the commanded output signal is above 1 mA, but internal feedback detects that physical loop current is lower than the setpoint, indicating a cut field wire or disconnected actuator load.

Question: Can the AO810 drive 0-10 V voltage actuators directly from its terminal blocks?

Answer: No, the module provides 0-20 mA and 4-20 mA unipolar current outputs. To control 0-10 V voltage devices, external precision load resistors (e.g., 500 Ω) must be connected across the field terminals to convert current to voltage.

Question: What is the primary operational difference between the AO810 and AO810V2 modules?

Answer: The AO810V2 is a direct functional replacement and hardware revision of the original AO810, offering updated internal components while maintaining identical electrical parameters, keying code AE, and complete backward compatibility with existing MTUs.

Question: Does the AO810 require external +24 V d.c. power to drive output current loops?

Answer: Yes, while logic power is drawn from the +5 V Modulebus (70 mA), field current loops require an external +24 V d.c. supply drawing up to 245 mA connected to the MTU power terminals.

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