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This gateway communications module bridges INFI 90 controllers with external serial devices. It translates data between the INFI 90 network and MODBUS protocols. The unit mounts in any INFI 90 rack slot as a protocol gateway.
Technical specifications
| Parameter | Specification |
|---|---|
| Brand | ABB Bailey |
| Model | ABB Bailey IMRAI03 |
| Product Family | INFI 90 |
| Category | Gateway Communications Module |
| Supported Protocols | MODBUS RTU, MODBUS ASCII, Bailey proprietary |
| Physical Interfaces | 1 x RS-232, 1 x RS-485 (selectable) |
| Baud Rate | 300 to 19.2 kbit/s (programmable) |
| Data Bits | 7 or 8 bits |
| Parity | None, odd, or even |
| Stop Bits | 1 or 2 bits |
| Maximum Nodes | 32 devices on RS-485 network |
| Data Mapping | 512 bytes input, 512 bytes output |
| Component Count | Approximately 105 components |
| Integrated Circuits | 14 ICs (processor, transceivers, optocouplers) |
| Power Supply | 24V DC external |
| Current Consumption | 200 mA typical |
| Status Indicators | 4 x LEDs (PWR, RUN, TX, RX) |
| Test Points | 6 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 gateway module connects INFI 90 controllers to MODBUS serial networks. It translates data between the DCS and third-party devices. The module supports both MODBUS RTU and MODBUS ASCII protocols. You select RS-232 or RS-485 physical interface via software configuration.
Now let us examine its data handling capacity. This module maps up to 512 bytes of input and output data. Approximately 105 components populate both sides of the circuit board. Fourteen integrated circuits include the protocol processor and line transceivers. The board contains no batteries or capacitors for energy storage.
This gateway module draws 200 milliamps from a 24V DC external supply. Four LEDs show power, run, transmit, and receive status. Six gold-plated test points allow serial signal verification. The module supports baud rates from 300 to 19.2 kbit/s for flexible integration.
Installation and Configuration Guidelines
You insert this module into any available INFI 90 rack slot. Connect the 24V DC power supply to the designated terminals. Attach the serial cable to the RS-232 or RS-485 port. Use shielded twisted-pair cables for RS-485 networks.
Configure the module using the INFI 90 engineering software. Set the baud rate, parity, and protocol for your application. Map INFI 90 data to MODBUS registers through the configuration tool. Always power down the rack before inserting or removing this module.
Practical Applications
Engineers use this gateway module for INFI 90 system integration and expansion. It connects the DCS to PLCs, drives, and flow computers. This component also works in legacy system retrofit projects. Its MODBUS support suits many industrial devices.
Summary of Features
To conclude, this gateway module supports MODBUS at up to 19.2 kbit/s. It weighs 0.48 kilograms and maps 512 bytes of data. Choose ABB Bailey IMRAI03 for reliable protocol gateway connectivity in INFI 90 systems.