ABB AI86‑16CHF PCB Card – High‑Density Analog Input Module

The ABB AI86-16CHF is a high-performance printed circuit board card designed for use with ABB distributed control systems and programmable logic controllers. Identified by the part number 5761751-9 B, this module provides 16 single-ended or 8 differential analog input channels, offering a flexible solution for process monitoring and data acquisition in industrial plants.

Analog Input Specifications

Each channel is individually configurable for standard analog signals including 4‑20 mA, 0‑20 mA, 0‑10 V, and ±10 V. The AI86-16CHF features a 16‑bit resolution analog-to-digital converter, delivering high accuracy and low drift over temperature. The input impedance is greater than 1 MΩ for voltage modes and 250 Ω for current mode, ensuring minimal loading on field sensors. The module supports a sampling rate of up to 250 samples per second per channel, suitable for fast process control loops.

Isolation and Protection

Galvanic isolation of 1500 V AC between the input channels and the system bus provides robust protection against ground loops and transient overvoltages. Each channel is also protected against reverse polarity and overcurrent, enhancing system reliability in harsh electrical environments. The AI86-16CHF includes on-board diagnostic LEDs for power and communication status, simplifying troubleshooting.

Communication and Integration

This PCB card communicates with the main controller via a parallel backplane interface, supporting high-speed data transfer and deterministic update times. It is fully compatible with ABB's Advant OCS, 800xA, and S+ Engineering systems, allowing seamless integration into existing automation architectures. The module can be hot-swapped without powering down the system, reducing downtime during maintenance.

Mechanical and Environmental Design

The board is built on a four-layer FR-4 substrate with gold-plated edge connectors for reliable electrical contact. It operates within a temperature range of 0 °C to 60 °C and is conformally coated to resist dust, moisture, and corrosive gases. The compact Eurocard format (100 mm x 160 mm) fits standard 19‑inch subracks, making it suitable for retrofit and new installations.

Typical Applications

The AI86-16CHF is widely used in oil and gas refineries, chemical plants, power generation, and water treatment facilities for monitoring temperature, pressure, flow, and level transmitters. Its high channel density reduces the number of modules required, optimizing cabinet space and overall system cost.

Calibration and Maintenance

Factory calibration is traceable to international standards, and the module supports user calibration via software to compensate for sensor and wiring offsets. Periodic recalibration intervals are recommended based on the application criticality. The board's self-test routines continuously monitor ADC reference voltages and supply rails, reporting any anomalies to the host controller.

Certifications

This ABB PCB card meets CE, UL, and CSA safety standards, and is compliant with RoHS directive. It also satisfies ATEX requirements for use in potentially explosive atmospheres when installed in suitable enclosures.

Overall, the AI86-16CHF (5761751-9 B) offers a reliable, high-precision analog input solution that enhances process visibility and control system performance in demanding industrial environments.