Product Overview
The ABB AI815 is an 8-channel analog input module designed for the S800 I/O system. It accepts unipolar single-ended signals of 0...20 mA, 4...20 mA, 0...5 V, or 1...5 V d.c., and provides HART pass-through communication. With 12-bit resolution and groupwise isolation, the AI815 delivers reliable signal acquisition for demanding industrial automation applications.
Technical Specifications
The ABB AI815 offers robust performance metrics that ensure accurate and stable readings:
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Resolution: 12 bit
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Input impedance: 10 MΩ (voltage input), 250 Ω (current input)
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Under/over range: 0 / +15% (0..20 mA, 0..5 V), -12.5% / +15% (4..20 mA, 1..5 V)
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Error: Max. 0.1%
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Temperature drift: Max. 50 ppm/°C
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Input filter (rise time 0-90%): 290 ms
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Update cycle time: 10 ms
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Maximum field cable length: 600 meters (656 yards)
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Power dissipation: 3.5 W
These specifications make the AI815 ideal for precise monitoring in process control environments.
Industry Applications
The ABB AI815 is well-suited for industries such as oil & gas, chemical, and power generation. For example, in a refinery, the module can monitor 4-20 mA signals from pressure transmitters, while its HART pass-through capability allows digital configuration and diagnostics without interrupting analog signals. The module's ability to withstand overvoltage or undervoltage of at least 11 V d.c. adds robustness to field wiring faults.
Installation & Setup
Mount the ABB AI815 on an S800 I/O rack using a compatible MTU such as TU810, TU812, TU814, TU830, TU833, TU835, or TU838. Ensure the keying code CC matches the MTU. When wiring, use shielded twisted-pair cables for analog signals and keep field wiring separate from power lines. The module supports 2-wire or 3-wire transmitters with current-limited supply, simplifying loop wiring. Verify that any external power supply used for HART transmitters is HART compatible.
Maintenance & Reliability
Routine inspection of the AI815 should include checking front LED indicators (Fault, Run, Warning) for status. The module supervises internal errors (analog read back, reference voltage, internal power supply, checksum, watchdog, memory) and external channel errors (external power supply low, transmitter power error). Operating temperature range is 0 to +55 °C, with approvals issued for +5 to +55 °C. Store the module between -40 to +70 °C. Relative humidity should remain between 5 to 95% non-condensing. These features reduce downtime and extend service life.
Compatibility & Integration
The ABB AI815 integrates seamlessly with ABB S800 I/O systems and is compatible with MTUs TU810, TU812, TU814, TU830, TU833, TU835, and TU838. It supports HART pass-through, allowing integration with HART-compatible field devices. The module is not redundant, not high-integrity, and not intrinsically safe, so it suits standard process control applications.
Buying Guide
Before purchasing the ABB AI815, verify that your system uses S800 mechanics and that the MTU keying code matches CC. Ensure your controller supports the AI815's update cycle time of 10 ms. For genuine parts and reliable supply, consider PLC Source PRO as your automation parts partner.