ABB AI845 Analog Input Module | 8-Channel

ABB AI845 Analog Input Module: Redundant-Capable HART Input

The ABB AI845 Analog Input Module provides reliable signal acquisition for both standard and critical applications. This versatile module supports single or redundant operation with advanced diagnostics and HART communication capabilities.

Flexible Input Configuration

• Eight configurable channels for voltage or current signals
• Supports 0-20 mA, 4-20 mA, 0-5 V, and 1-5 V DC signals
• With MTU TU844 or TU845: mixed voltage/current per channel
• With other MTUs: all channels as voltage or current inputs
• Unipolar single-ended signal type for standard applications
• High input impedance: 10 MΩ for voltage measurements
• Standard 250 Ω input resistance for current loops

Redundant Operation & Safety

• Supports both single and redundant operation modes
• Built-in redundancy for critical process applications
• Withstands overvoltage/undervoltage up to 11V DC
• Group-wise isolation from ground for enhanced safety
• Rated insulation voltage: 50V for industrial safety
• Dielectric test voltage: 500V AC for insulation integrity
• Current-limited transmitter supply per channel

Technical Performance

• 12-bit resolution for precise measurement accuracy
• Maximum error: 0.1% for reliable process monitoring
• Low temperature drift: maximum 50 ppm/°C
• Input filter: 290 ms rise time (0-90%) for signal stability
• Fast update cycle time: 10 ms for responsive control
• Excellent NMRR > 40 dB at 50Hz/60Hz for noise rejection
• Field cable length up to 600 meters (656 yards)

Power Specifications

• Power dissipation: 3.5 W for efficient operation
• Current consumption: 100 mA from +5V Modulebus
• Additional 50 mA from +24V Modulebus supply
• External +24V consumption: maximum 265 mA
• Current-limited transmitter supply per channel
• Supervised external power supply monitoring
• Robust power management for reliable operation

Environmental Specifications

• Operating temperature: 0 to +55°C (32 to 131°F)
• Storage temperature: -40 to +70°C (-40 to 158°F)
• Relative humidity: 5 to 95% non-condensing
• IP20 protection rating per IEC 60529 standard
• ISA-S71.04 G3 corrosion protection level
• Pollution degree 2 per IEC 60664-1
• Suitable for industrial control environments

System Integration

• Wide MTU compatibility: TU810, TU812, TU814, TU818, TU830, TU833
• Also compatible with TU835, TU838, TU844, TU845, TU854
• Keying code CC ensures proper module insertion
• Compact S800 mechanics: 45mm × 102mm × 119mm
• Lightweight design: 0.23 kg (0.51 lbs)
• Article number: 3BSE023675R1 for identification
• Seamless ABB S800 system integration

Range Monitoring

• Under/over range monitoring for all signal types
• 0-20 mA and 0-5 V: 0% / +15% range limits
• 4-20 mA and 1-5 V: -12.5% / +15% range limits
• Early warning for signal deviation detection
• Prevents undetected sensor or signal failures
• Enables predictive maintenance capabilities
• Enhances overall system reliability

Frequently Asked Questions (FAQ)

• What makes the AI845 suitable for redundant applications?
  The AI845 supports both single and redundant operation modes with built-in redundancy capabilities.
• Does the module support HART communication?
  Yes, it features HART pass-through communication on all eight input channels.
• Can I mix voltage and current inputs on the same module?
  Yes, when using MTU TU844 or TU845, you can mix signal types per channel.
• What diagnostic capabilities are available?
  Advanced diagnostics include module, internal channel, and external channel error monitoring.
• What is the maximum update rate?
  The module provides a fast 10 ms update cycle time for responsive control.

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