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This analog input module converts current signals from field transmitters into digital values. It serves the INFI 90 distributed control system for process monitoring. The unit mounts in any INFI 90 rack slot.
Technical specifications
| Parameter | Specification |
|---|---|
| Brand | ABB Bailey |
| Model | ABB Bailey IMASI02S |
| Product Family | INFI 90 |
| Category | Analog Input Module |
| Number of Channels | 8 (eight) independent inputs |
| Input Signal Types | 0-20mA, 4-20mA (selectable) |
| Input Impedance | 250 Ω |
| Resolution | 12 bits (0 to 4095 counts) |
| Accuracy | ±0.1% of full scale |
| Update Rate | 10 ms per channel |
| Common Mode Rejection | 80 dB at 60 Hz |
| Normal Mode Rejection | 40 dB at 60 Hz |
| Isolation | 500V RMS (channel to backplane) |
| Component Count | Approximately 110 components |
| Integrated Circuits | 14 ICs (ADC, op-amps, optocouplers) |
| Power Supply | 24V DC external |
| Current Consumption | 180 mA typical |
| Status Indicators | 3 x LEDs (PWR, RUN, FLT) |
| Test Points | 8 gold-plated test points |
| Energy Storage | None (no battery or capacitor) |
| Dimensions (L x W x H) | Approx. 22 cm x 11 cm x 3.5 cm |
| Weight | Approx. 0.48 kg |
| Operating Temperature | 0°C to 55°C |
| Mounting | INFI 90 rack slot |
Detailed Technical Analysis
This analog input module reads eight independent 4-20mA or 0-20mA current signals. It converts each analog value into a 12-bit digital number. The module sends this data to the INFI 90 controller for processing. The input impedance of 250 ohms loads the loop minimally.
Now let us examine its accuracy characteristics. This module achieves ±0.1% accuracy across the full input range. The update rate reaches 10 milliseconds per channel for fast response. Approximately 110 components populate both sides of the circuit board. Fourteen integrated circuits include the analog-to-digital converter and op-amps.
This analog module draws 180 milliamps from a 24V DC external supply. Three LEDs show power, run, and fault status for diagnostics. The board contains no batteries or capacitors for energy storage. Eight gold-plated test points allow signal verification during commissioning. The module provides 500V RMS isolation for noise immunity.
Installation and Wiring Guidelines
You insert this module into any available INFI 90 rack slot. Connect the 24V DC power supply to the designated terminals. Wire each current loop to the two-wire input terminals. Select 0-20mA or 4-20mA mode using jumper blocks on the board.
Use shielded twisted-pair cables for all analog input connections. Ground the shield only at the module end for noise reduction. Configure each channel through the INFI 90 engineering software. Always power down the rack before inserting or removing this module.
Practical Applications
Engineers use this analog module for INFI 90 system expansion and repair. It monitors pressure, flow, and level from 4-20mA transmitters. This component also works in legacy DCS retrofit projects. Its eight channels suit medium-sized process monitoring applications.
Summary of Features
To conclude, this analog input module provides eight 4-20mA channels with 12-bit resolution. It weighs 0.48 kilograms and draws 180 milliamps at 24V. Choose ABB Bailey IMASI02S for reliable current input acquisition in INFI 90 systems.