Description
Foxboro FBM218 Technical Specifications:
- Module Type: Pulse/Frequency Input.
- Channels: Multiple pulse input channels.
- Signal Type: TTL, open collector, or sine wave pulses.
- Frequency Range: Wide frequency acquisition range.
Functional Features:
- High-Speed Counting: Accurate accumulation of pulse totals.
- Frequency Measurement: Real-time calculation of process rate.
- Totalizer Function: Internal accumulation with rollover protection.
- Noise Filtering: Adjustable digital filters to reject electrical noise.
Application Scenarios:
- Turbine and positive displacement flow metering.
- Tachometer and speed monitoring for rotating equipment.
- Batch counting and production tracking.
Performance Parameters:
- Max Frequency: High-frequency capability for fast flow processes.
- Resolution: High-resolution counting for accurate totalization.
- Accuracy: Precise frequency-to-engineering-unit conversion.
Material Composition & Structural Characteristics:
- Circuitry: High-speed comparators and digital counters.
- Isolation: Opto-isolation for pulse inputs.
Working Principle: Incoming pulse signals are conditioned and shaped into clean digital edges. The module’s counter/timer circuits measure the time between pulses (frequency) and accumulate the total count. Data is periodically updated to the controller.
Installation Requirements:
- Use shielded cables for pulse signals.
- Keep pulse cables separate from analog and power cables.
- Configure signal type (TTL, etc.) and filter settings in software.
Usage Precautions:
- Verify signal voltage levels match module input specifications.
- Ensure proper termination for high-frequency signals.
- Monitor for missed pulses due to excessive noise or signal attenuation.
