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This digital input module reads discrete signals from field sensors and switches. It serves the INFI 90 distributed control system for digital monitoring. The unit mounts in any INFI 90 rack slot.
Technical specifications
| Parameter | Specification |
|---|---|
| Brand | ABB Bailey |
| Model | ABB Bailey IMDSI15 |
| Product Family | INFI 90 |
| Category | Digital Input Module |
| Number of Channels | 16 (sixteen) independent inputs |
| Input Voltage | 24V DC nominal (20V to 30V) |
| Input Current | 7 mA per channel |
| Signal “0” Range | 0V to 5V DC |
| Signal “1” Range | 15V to 30V DC |
| Input Delay | 5 ms typical |
| Isolation | 500V RMS (optical) |
| Component Count | Approximately 95 components |
| Integrated Circuits | 12 ICs (optocouplers, logic, filters) |
| Power Supply | 24V DC external |
| Current Consumption | 150 mA (logic) |
| Status Indicators | 16 x LEDs (input status), 2 x LEDs (PWR, RUN) |
| Test Points | 4 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. 0.46 kg |
| Operating Temperature | 0°C to 55°C |
| Mounting | INFI 90 rack slot |
Detailed Technical Analysis
This digital input module accepts sixteen independent 24V DC input signals. Each channel features a dedicated LED status indicator on the front panel. This visual feedback helps you troubleshoot field wiring problems quickly. The unit optically isolates each input from the system backplane.
Now let us examine its electrical characteristics. The ABB Bailey IMDSI15 draws only 7 mA per activated channel. A logical “1” signal requires between 15 and 30 volts DC. Conversely, any voltage below 5 volts registers as a logical “0”. This wide hysteresis makes the module highly noise-immune.
The module draws 150 milliamps for its internal logic circuits. It contains no batteries or capacitors for energy storage. Its 5-millisecond input delay suits most industrial switching applications. The ABB Bailey IMDSI15 provides 500V RMS optical 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 sensor to its corresponding screw terminal pair. Use shielded twisted-pair cable for input wiring to reduce electrical noise.
For reliable operation, connect each sensor using twisted-pair cable. The module operates perfectly between 0 and 55 degrees Celsius. Avoid mounting it next to high-power AC devices inside the cabinet. Always power down the rack before inserting or removing this module.
Practical Applications
Engineers use this input module for INFI 90 system expansion and repair. It reads pushbuttons, limit switches, and proximity sensors. This component also works in legacy DCS retrofit projects. Its 16 channels suit medium-sized digital input requirements.
Summary of Features
To conclude, this digital input module provides 16 channels with 5ms input delay. It weighs 0.46 kilograms and draws 150 milliamps at 24V. Choose ABB Bailey IMDSI15 for reliable digital input acquisition in INFI 90 systems.