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- Non-Isolated Input Modules
- Sweden (SE)
- 140 x 110 x 50 mm
- 0.5 kg
- Xiamen, China
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Product Overview
The ABB Bailey IMRAI12 Non-Isolated Input Module is part of the ABB INFI 90 / Network 90 distributed control system (DCS). It is used to acquire analog field signals such as 4–20 mA and voltage inputs from industrial instruments and transmit them to the control system for processing.
Unlike isolated input modules, the IMRAI12 is designed for non-isolated signal acquisition, making it suitable for installations where signal conditioning and system grounding are managed at the panel level.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | ABB (Bailey) |
| Model | IMRAI12 |
| Product Type | Non-Isolated Analog Input Module |
| System | INFI 90 / Network 90 DCS |
| Function | Analog signal acquisition |
| Input Types | 4–20 mA, 1–5 V (typical configuration) |
| Channel Capacity | Multi-channel analog inputs (system dependent) |
| Signal Processing | A/D conversion, filtering, scaling |
| Isolation | Non-isolated design |
| Communication | INFI 90 system backplane bus |
| Installation Type | Rack-mounted module |
| Application | Industrial process monitoring and control |
| Dimensions | 140 × 110 × 50 mm |
| Weight | 0.5 kg |
Function and Working Principle
The IMRAI12 operates as a direct analog signal acquisition module within the ABB Bailey DCS architecture.
Its main functions include:
- Receiving analog signals from field instruments
- Converting analog signals into digital process values (A/D conversion)
- Applying basic signal filtering and scaling
- Transmitting data to the central controller
- Supporting continuous process monitoring
Because it is non-isolated, signal grounding and noise management are handled at the system level.
Role in Industrial Control Systems
Within ABB INFI 90 systems, the IMRAI12 belongs to the analog input acquisition layer.
Typical roles include:
- Monitoring process variables (pressure, flow, temperature)
- Providing real-time analog feedback to controllers
- Supporting control loop operation
- Feeding alarm and trend systems
- Enabling plant-wide process visibility
Industrial Applications
The ABB IMRAI12 is widely used in:
- Power generation plants
- Oil and gas facilities
- Petrochemical and refinery industries
- Chemical processing plants
- Water treatment systems
- Heavy industrial automation systems
- Legacy ABB Bailey INFI 90 / Network 90 installations
Installation and System Integration
For proper operation:
- Install in ABB INFI 90 compatible rack systems
- Ensure correct slot assignment and addressing
- Maintain proper system grounding due to non-isolated design
- Use shielded cables to reduce electrical noise
- Separate analog wiring from high-voltage lines
- Perform calibration during commissioning
Compatible System Components
The IMRAI12 typically works with:
- ABB Bailey INFI 90 controllers (BRC / MFP series)
- Analog output modules
- Digital I/O modules
- Power supply modules
- Field transmitters (4–20 mA devices)
- System backplane and racks
- Signal conditioning hardware
Recommended Alternative Models
| Model | Product Type | Key Feature | Application |
|---|---|---|---|
| IMRAI12 | Non-Isolated Analog Input | Standard analog acquisition | ABB INFI 90 systems |
| IMFEC12 | Analog Input Module | Higher channel density & smart transmitter support | Process control |
| IMASI02 | Analog Input Slave | Isolated analog input variant | Noisy environments |
| AIN300 | Modern ABB analog input | Higher precision & modern systems | Symphony / 800xA |
| HIMA F6204 | Safety analog input | SIS-grade monitoring | Safety systems |
Key Advantages
- Stable analog signal acquisition
- Simple and cost-efficient architecture
- Reliable integration with ABB Bailey systems
- Suitable for standard industrial environments
- Supports continuous process monitoring
- Proven performance in legacy DCS installations
- Easy system expansion in rack-based setups
Limitations
- No electrical isolation (requires careful grounding design)
- Less suitable for high-noise industrial environments
- Relies on system-level signal protection
Technical FAQs
What is the main function of IMRAI12?
It collects analog signals from field devices and converts them into digital values for the ABB control system.
What type of signals does it support?
Typically 4–20 mA and voltage-based analog signals.
Why is it called “non-isolated”?
Because it does not provide channel-to-system electrical isolation; grounding is handled externally.
Where is it used?
In ABB Bailey INFI 90 / Network 90 distributed control systems.
Conclusion
The ABB Bailey IMRAI12 Non-Isolated Input Module is a cost-effective analog signal acquisition component in legacy ABB DCS systems. While it lacks internal isolation, it provides reliable and stable process data acquisition when used in properly engineered industrial environments.