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This digital output module drives high-current actuators from your INFI 90 system. It uses electromechanical relays for switching heavy loads directly. The unit mounts in any INFI 90 rack slot for reliable output control.
Technical specifications
| Parameter | Specification |
|---|---|
| Brand | ABB Bailey |
| Model | ABB Bailey DOT120 |
| Product Family | INFI 90 |
| Category | Digital Output Module |
| Number of Channels | 12 (twelve) independent outputs |
| Output Type | Electromechanical relay (Form C) |
| Contact Rating | 2A at 250V AC / 30V DC |
| Maximum Inrush Current | 10A for 20 ms |
| Output Delay | 10 ms typical (operate), 5 ms (release) |
| Relay Configuration | SPDT (NO/NC common) |
| Mechanical Life | 10 million operations |
| Electrical Life | 100,000 operations at rated load |
| Isolation | 1500V RMS (coil to contacts) |
| Component Count | Approximately 110 components |
| Integrated Circuits | 14 ICs (drivers, optocouplers) |
| Power Supply | 24V DC external (logic) |
| Current Consumption | 200 mA (logic) + coil current |
| Status Indicators | 12 x LEDs (output status), 2 x LEDs (PWR, RUN) |
| Energy Storage | None (no battery or capacitor) |
| Dimensions (L x W x H) | Approx. 24 cm x 12 cm x 4 cm |
| Weight | Approx. 0.65 kg |
| Operating Temperature | 0°C to 55°C |
| Mounting | INFI 90 rack slot |
Detailed Technical Analysis
This digital output module provides twelve Form C relay outputs for heavy loads. Each relay switches up to 2 amps at 250V AC or 30V DC. The contacts can handle 10 amp inrush currents for motor and lamp loads. The module provides both normally open and normally closed contact options.
Now let us examine its relay characteristics. Each channel features a dedicated LED indicator on the front panel. The relay mechanical life reaches 10 million operations without load. Electrical life reaches 100,000 operations at full rated load. The output delay is 10 milliseconds for operate and 5 milliseconds for release.
This output module draws 200 milliamps for its internal logic circuits. The relay coils draw additional current from the same 24V supply. The ABB Bailey DOT120 provides 1500V RMS isolation between logic and field circuits. The board contains no batteries or capacitors for energy storage.
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 load to the common and NO or NC contact terminals. Use appropriate wire gauges for 2-amp current capacity.
For AC loads, ensure proper phase connections to the relay contacts. For inductive loads, add appropriate suppression devices across the contacts. The module operates perfectly between 0 and 55 degrees Celsius. Always power down the rack before inserting or removing this module.
Practical Applications
Engineers use this output module for INFI 90 system expansion and heavy load control. It switches pumps, fans, heaters, and motor starters directly. This component also works in legacy DCS retrofit projects. Its relay outputs suit mixed AC/DC load applications.
Summary of Features
To conclude, this digital output module provides 12 relay channels at 2 amps each. It weighs 0.65 kilograms and offers 1500V RMS isolation. Choose ABB Bailey DOT120 for reliable heavy-duty output control in INFI 90 systems.