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System Overview
This distributed control system module provides redundant analog input measurement capabilities. You can install ABB Bailey IMRAI02 directly into INFI 90 I/O racks. The unit features dual input channels per sensor for fault tolerance. It automatically selects the valid signal when one channel fails.
Technical Specifications
| Parameter | Value |
|---|---|
| Dimensions (W x H x D) | 233 mm x 160 mm x 20 mm |
| Weight | 0.47 kg |
| Redundant input pairs | 8 dual-channel pairs (16 total inputs) |
| Input signal ranges | 0-10V, ±10V, 0-20 mA, 4-20 mA |
| Input resolution | 14-bit (0-16383 counts) |
| Accuracy | ±0.15% of full scale |
| Redundancy management | Automatic voting (1oo2) |
| Switchover time | < 5 ms after channel fault |
| Channel isolation | 1500V RMS (field to backplane) |
| Status indicators | 2 LEDs per pair (channel A/B fault) |
| Interface to backplane | INFI 90 rack connector |
| Total onboard components | 368 discrete parts |
| Energy storage type | Tantalum and ceramic capacitors |
| Energy storage rating | 560 µF at 25V DC |
| Operating temperature | 0°C to +55°C |
Board Layout and Components
The PCB arranges eight redundant input pairs across the board surface. Each pair shares a common analog-to-digital converter with voting logic. Moreover, 368 discrete components include precision resistors and isolation amplifiers. Tantalum capacitors stabilize voltage references for accurate conversions. Consequently, the system maintains measurement integrity despite individual channel failures.
Installation Process
You can mount ABB Bailey IMRAI02 into any standard INFI 90 I/O rack slot. The backplane connector supplies power and transfers selected data to the controller. Furthermore, a front panel screw terminal block accepts dual field wiring for each sensor. Configuration software sets input ranges and fault thresholds easily.
Performance Advantages
This module switches to the backup channel within 5 milliseconds of detecting a fault. The 1oo2 voting scheme prevents single-point failures from shutting down the loop. Therefore, critical process measurements continue without interruption. The 14-bit resolution also captures small signal variations accurately.
Safety and Compliance
ABB Bailey IMRAI02 meets CE and RoHS industrial standards. The board discharges stored energy below 3V within six seconds. Hence, technicians face minimal electrical risk during installation or replacement.