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This pulse input module captures high-speed pulse trains from flow meters and encoders. It counts pulses and calculates frequency or totalized values for process monitoring. The unit mounts in any INFI 90 rack slot.
Technical specifications
| Parameter | Specification |
|---|---|
| Brand | ABB Bailey |
| Model | ABB Bailey SPDSM04 |
| Product Family | INFI 90 |
| Category | Pulse Input Module |
| Number of Channels | 4 (four) independent pulse inputs |
| Maximum Frequency | 10 kHz per channel |
| Pulse Types | Square wave, sine wave, contact closure |
| Input Voltage | 24V DC nominal (12V to 30V) |
| Input Impedance | 10 kΩ |
| Counter Resolution | 16 bits (0 to 65,535 counts) |
| Frequency Accuracy | ±0.05% of reading |
| Totalizer Capacity | 32 bits (0 to 4.29 billion counts) |
| Minimum Pulse Width | 50 microseconds |
| Input Debounce | Configurable (0 to 50 ms) |
| Isolation | 500V RMS (optical) |
| Component Count | Approximately 95 components |
| Integrated Circuits | 12 ICs (counter, optocouplers, logic) |
| Power Supply | 24V DC external |
| Current Consumption | 150 mA typical |
| Status Indicators | 4 x LEDs (pulse activity), 2 x LEDs (PWR, RUN) |
| Energy Storage | None (no battery or capacitor) |
| Dimensions (L x W x H) | Approx. 20 cm x 10 cm x 3.5 cm |
| Weight | Approx. 0.44 kg |
| Operating Temperature | 0°C to 55°C |
| Mounting | INFI 90 rack slot |
Detailed Technical Analysis
This pulse input module accepts four independent high-speed pulse signals. It handles frequencies up to 10 kHz from flow meters and encoders. The module counts pulses using a 16-bit counter per channel. It also provides a 32-bit totalizer for accumulated flow measurement.
Now let us examine its input flexibility. The module accepts square wave, sine wave, or dry contact signals. You can configure input debounce from 0 to 50 milliseconds. The frequency accuracy reaches ±0.05% of the actual reading. Each channel has a dedicated LED to show pulse activity.
This pulse module draws 150 milliamps from a 24V DC external supply. Two LEDs indicate power and run status for the module. The ABB Bailey SPDSM04 contains no batteries or capacitors for energy storage. Optical isolation provides 500V RMS protection between field inputs and logic circuits.
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 pulse source to its corresponding screw terminal pair. Use shielded twisted-pair cables for all pulse input connections.
For contact closure inputs, ensure clean, bounce-free switch operation. Configure the debounce time through the INFI 90 engineering software. The module automatically scales frequency to engineering units based on your settings. Always power down the rack before inserting or removing this module.
Practical Applications
Engineers use this pulse module for INFI 90 system expansion and flow monitoring. It measures flow rates from turbine and magnetic flow meters. This component also works in legacy DCS retrofit projects. Its four channels suit multi-point flow totalization applications.
Summary of Features
To conclude, this pulse input module handles 4 channels at 10 kHz each. It weighs 0.44 kilograms and includes 16-bit counters. Choose ABB Bailey SPDSM04 for reliable pulse acquisition in INFI 90 systems.