ABB AI880A High Integrity Analog Input Module for SIL3 Applications

Technical Specifications Breakdown

The AI880A offers 12-bit resolution for accurate 0...20 mA and 4...20 mA single-ended unipolar inputs. Input impedance is 250 Ω with shunt stick TY801. Isolation is groupwise from ground, with a rated insulation voltage of 50 V and dielectric test voltage of 500 V a.c. Error is max 0.1%, with temperature drift max 50 ppm/°C. The input filter rise time (0-90%) is 190 ms, and update cycle time is 10 ms. Power dissipation is 2.4 W, with current consumption +5 V Modulebus 45 mA, +24 V Modulebus max 50 mA, and +24 V external 4 + transmitter current mA, max 260 mA.

Industry Applications

In oil and gas refineries, the AI880A monitors critical process variables like pressure and flow from 2-wire transmitters, ensuring SIL3-rated safety loops. In chemical plants, its redundant configuration provides fault tolerance for emergency shutdown systems. The module's HART pass-through communication enables remote diagnostics and configuration without interrupting the analog signal.

Installation & Setup Guidance

Mount the AI880A in an S800 series I/O rack using MTU TU834, TU844, TU845, or TU854. Ensure the module bus provides 24 V power. Connect field wiring for 2- or 3-wire transmitters per the wiring diagram. The module supports maximum field cable length of 600 meters (656 yards). Use the keying code FD to prevent incorrect insertion. For vertical mounting in compact MTU, note the max ambient temperature of 40 °C (104 °F).

Maintenance & Reliability

The AI880A includes advanced on-board diagnostics with front LEDs for Fault, Run, and Warning. Supervision covers internal voltage, field power input, and field power output per channel. Status indication reports module error, module warning, and channel error. Operating temperature range is 0 to +55 °C (+32 to +131 °F), with storage from -40 to +70 °C (-40 to +158 °F). The module is protected to IP20 and complies with ISA-S71.04 G3 corrosion protection. Regular inspection of field wiring and transmitter power is recommended to maintain SIL3 integrity.

What Is the ABB AI880A?

Designed for single or redundant configurations, this module provides 8 current input channels with 250 ohm input resistance. It distributes external transmitter supply to each channel, simplifying connections for 2- or 3-wire transmitters. The AI880A complies with NAMUR NE43 and supports configurable over- and under-range limits.

Compatibility & Integration

It works with MTU TU834, TU844, TU845, or TU854. The module is certified for SIL3 per IEC 61508 and Category 4 per EN 954-1. It carries CE mark, electrical safety per EN 61010-1 and UL 61010-1, hazardous location approvals (C1 Div 2 cULus, C1 Zone 2 cULus, ATEX Zone 2), and marine certifications from ABS, BV, DNV, LR.

Buying Guide & Selection Advice

Before purchasing the AI880A, verify your system's compatibility with the S800 series and required MTU. The module is available as article number 3BSE039293R1. For redundant configurations, order two modules and configure accordingly. AutoDCSTech stocks the AI880A and can advise on availability and replacement options for legacy systems.