AO845A-eA Analog Output Module 

1. Key Parameters

• Number of Output Channels: 4 independent, isolated channels (channel-to-channel isolation)
• Supported Signal Types:
  • Current output: 4-20mA DC (load resistance: 0-600Ω)
  • Voltage output: 0-10V DC (load resistance: ≥10kΩ)
• Output Accuracy: ±0.1% of full scale (at 25℃); ±0.2% of full scale (within operating temperature range)
• Resolution: 16 bits
• Update Rate: 50ms per channel (configurable for faster response in critical applications)
• Power Supply: 24V DC (±10% tolerance); Typical power consumption: ≤6W (full load)
• Operating Temperature Range: -20℃~+60℃
• Storage Temperature Range: -40℃~+85℃
• Isolation Level: 2.5kVrms (channel-to-channel, channel-to-power supply, channel-to-backplane)
• Communication Interface: Compatible with Modbus RTU and Profinet (for integration with 800xA system)
• Installation Method: 35mm standard DIN rail mounting
• Protection Class: IP20 (module body); Complies with IEC 61010-1 safety standards

2. Product Features

• High Stability & Precision: Equipped with a high-performance 16-bit D/A converter and built-in signal conditioning circuit, ensuring low temperature drift (≤50ppm/℃) and minimal output ripple (≤20mVp-p), suitable for precision process control.
• Channel Isolation: 2.5kVrms galvanic isolation between channels prevents cross-interference and ground loops, enhancing reliability in complex industrial electrical environments.
• Flexible Configuration: Each channel can be independently set to current or voltage output via software (no hardware modification required), adapting to diverse actuator types.
• Fault Detection & Protection: Integrates overcurrent protection (auto-recovery) and short-circuit protection for each channel; provides open-circuit detection for current output mode, facilitating quick fault diagnosis.
• Seamless System Integration: Optimized for ABB 800xA control system, supporting online parameter configuration and status monitoring; compatible with third-party PLCs via Modbus RTU.
• Industrial Durability: Adopts flame-retardant ABS housing (compliant with UL94 V-0) and anti-vibration design (IEC 60068-2-6), ensuring stable operation in dusty, humid, or vibration-prone industrial sites.

3. Application Fields

• Process Industry: Precise control of flow, pressure, and temperature control valves in chemical plants, oil refineries, and petrochemical facilities.
• Power Sector: Regulation of steam turbines, boiler feedwater valves, and renewable energy (solar/wind) inverter output.
• Manufacturing Automation: Speed control of variable-frequency drives (VFDs) for production line conveyors, pumps, and fans; tension control of rolling mills in steel production.
• Water & Wastewater Treatment: Control of dosing pumps, gate valves, and aeration systems in water purification and sewage treatment plants.
• Pharmaceutical & Food Industry: Precision control of mixing speed, temperature, and pressure in sterile production processes (complies with GMP-related electrical safety requirements).

4. Precautions

• Before installation, confirm the power supply voltage matches 24V DC (±10%) to avoid damage to the internal circuit.
• Ensure the load resistance of the connected actuator is within the module’s specified range (e.g., ≤600Ω for 4-20mA output) to prevent signal distortion.
• Use shielded twisted-pair cables for signal lines, and connect the cable shield to the system’s protective ground to reduce electromagnetic interference (EMI).
• When replacing the module, perform hot-swap only if the 800xA system supports it; otherwise, power off the I/O rack first to avoid transient voltage spikes.
• Regularly calibrate the module (per ABB’s recommended cycle, typically 12 months) to maintain output accuracy, especially in critical process control applications

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