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Bachmann AO202/SI Analog Output Module

1. Product Description

A high-precision industrial analog output module designed for reliable generation and control of standard analog signals in automation systems. The Bachmann AO202/SI features 2 independent analog output channels, optimized to drive actuators, valves, and variable-speed drives in harsh industrial environments. It supports multiple output signal types, robust electrical protection, and seamless integration with Bachmann controllers (MPC240) and backplanes (BS208/BS209), making it ideal for applications requiring precise, stable analog signal output for process control.

2. Detailed Specifications

2.1 Channel & Signal Configuration

Total Channels: 2 independent analog output channels

Supported Signal Types: 4-20 mA DC, 0-20 mA DC, 0-10 V DC, ±10 V DC (software-configurable per channel)

Output Accuracy: ±0.05% of full scale (at 25°C ±5°C); ±0.1% over operating temperature range

Update Rate: Up to 100 Hz per channel (configurable; ensures real-time signal adjustment)

Output Impedance: ≤0.1 Ω (for current signals); ≥100 kΩ (for voltage signals)

2.2 Electrical Performance

Load Capacity:

Current signals: Max 500 Ω (4-20 mA/0-20 mA)

Voltage signals: Min 1 kΩ (0-10 V/±10 V)

Isolation: 3 kV AC isolation between channels; 5 kV AC isolation between I/O and power lines (prevents cross-interference)

Ripple & Noise: <10 mVpp (for voltage signals); <50 μApp (for current signals)

Overload Protection: Short-circuit protection (current channels, auto-recovery); overvoltage protection (±30 V DC for voltage channels)

2.3 Communication & Integration

Interface Type: 1×backplane connector (compatible with Bachmann BS208/BS209 backplanes)

Data Transmission: Real-time signal command reception from host controllers; maximum throughput 100 Mbps

Protocol Support: Bachmann proprietary analog control protocol; compatible with Modbus RTU (via backplane)

2.4 Power Supply

Input Voltage: 24 V DC ±20% (powered via backplane or external 24 V DC)

Power Consumption: Typical 2.5 W, Maximum 4 W (excluding load power)

Power Protection: Overvoltage, undervoltage, and reverse polarity protection

2.5 Operating Environment

Operating Temperature: -40°C ~ +70°C

Storage Temperature: -40°C ~ +85°C

Relative Humidity: 5% ~ 95% (non-condensing)

Vibration Resistance: 10-500 Hz, 2 g acceleration (IEC 60068-2-6)

Shock Resistance: 30 g acceleration, 11 ms duration (IEC 60068-2-27)

EMC Compliance: EN 61000-6-2 (immunity), EN 61000-6-4 (emissions)

2.6 Physical & Software

Dimensions: 80×75×28 mm (L×W×H)

Mounting: DIN rail (via backplane integration; EN 50022 standard)

Weight: ~110 g

Programming Software: Bachmann Studio (v4.0+; channel configuration, zero/full-scale calibration, output monitoring)

LED Indicators: 2 channel-status LEDs (green: normal output); 1 power LED (green); 1 fault LED (red: overload/short-circuit)

3. Advantages & Features

High-Precision Output: ±0.05% full-scale accuracy and low ripple/noise ensure stable control of actuators and drives.

Flexible Signal Support: 4 configurable signal types (current/voltage) adapt to diverse industrial loads (valves, VFDs).

Strong Isolation & Protection: 3 kV channel isolation and auto-recovery overload protection enhance reliability in noisy environments.

Seamless System Integration: Works with Bachmann PLCs (MPC240) and backplanes (BS208/BS209), simplifying control system build.

Easy Calibration & Monitoring: Software-based calibration (no manual pots) and real-time status LEDs reduce maintenance effort.

4. Application Fields

Process Control: Chemical/petroleum plants (valve position control via 4-20 mA; reactor temperature regulation via ±10 V drives).

Industrial Drives: Variable-speed motor control (VFDs powered by 0-10 V/4-20 mA signals); pump speed adjustment for water treatment.

Building Automation: HVAC system damper control (0-10 V signals for airflow regulation); lighting dimming via analog output.

Renewable Energy: Solar inverter power regulation (4-20 mA for grid-tie current control); wind turbine pitch control via analog signals.

Test & Measurement: Calibration of industrial sensors (stable 0-10 V/4-20 mA reference signals); simulation of sensor outputs for system testing.

5. Precautions

Installation: Integrate only with compatible Bachmann backplanes (BS208/BS209); power off backplane before module insertion/removal to protect connectors.

Wiring: Use shielded cables for output signals; ensure load impedance matches channel specs (e.g., ≥1 kΩ for voltage outputs); separate analog cables from high-voltage power lines.

Load Management: Do not exceed maximum load resistance (500 Ω for current channels); use external signal amplifiers for high-impedance loads (>500 Ω).

Calibration: Perform annual calibration in a temperature-stable environment (20°C ~ 25°C); back up calibration data via Bachmann Studio to avoid reconfiguration after module replacement.

Maintenance: Inspect output terminals quarterly (tighten loose connections); clean module with a dry cloth (avoid liquids); do not disassemble (voids warranty and risks isolation failure).

The structure and details of the product：
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