ABB Bailey NASI02/F Analog Input Module

Signal Acquisition and Conversion Performance

The ABB Bailey NASI02/F converts analog field signals into digital values for control systems. This module accepts multiple input types from sensors and transmitters. It provides high-resolution measurement for precise process control applications.

Technical Specifications

Parameter	Specification
Model	NASI02/F
Category	Analog Input Module
Height	267 mm
Width	35 mm
Depth	185 mm
Weight	0.58 kg
Input Channels	8 x differential analog inputs
Input Signal Types	4-20 mA, 0-20 mA, 0-10 V, ±10 V
Resolution	14 bits (16 bits with filtering)
Accuracy	±0.1% of full scale at 25°C
Sampling Rate	100 Hz per channel
Input Impedance	250 Ω (current), 100 kΩ (voltage)
Common Mode Rejection	86 dB at 50/60 Hz
Connector Type	2 x 10-pin screw terminal blocks
Status Indicators	1 x green PWR LED, 1 x red FLT LED
Internal Components	1 ADC chip, 1 multiplexer, 1 input filter board
Energy Storage	10 µF input filtering capacitor per channel

Internal Architecture and Signal Processing

The NASI02/F contains three main internal components for signal conversion. One 14-bit ADC chip converts analog signals to digital values. One multiplexer scans all eight channels sequentially. An input filter board removes high-frequency noise from each channel. The ABB Bailey NASI02/F also includes a 10 µF capacitor per channel for filtering. Two 10-pin terminal blocks provide all field wiring connections.

Input Configuration and Wiring Guidelines

Configure each channel’s input type using the software settings. Select current or voltage mode through the configuration menu. Connect 4-20 mA transmitters to the positive and negative terminal pairs. Use twisted-pair shielded cable for all analog signal wiring. The NASI02/F provides 86 dB of common mode noise rejection. This feature ensures accurate readings in electrically noisy environments.

Physical Dimensions and Installation Requirements

The ABB Bailey NASI02/F weighs only 0.58 kilograms for easy handling. Its height measures 267mm, width 35mm, and depth 185mm. This analog input module consumes 2.8 watts from the backplane supply. Install the NASI02/F in any standard Bailey I/O rack slot. The module operates reliably from 0°C to +60°C ambient temperature. The green PWR LED lights up when backplane power is present.

Sampling Performance and Data Update Rate

The NASI02/F samples each channel at 100 Hz continuously. It updates all eight channel values every 80 milliseconds. You can enable digital filtering for noisy signal environments. The filter averages 16 samples for 16-bit effective resolution. The red FLT LED indicates an input wire break or out-of-range condition.