Description
Foxboro FBM219 Technical Specifications:
- Module Type: Analog Output (AO).
- Channels: 8 channels.
- Output Signal: 4-20 mA or 0-20 mA.
- System: Foxboro I/A Series.
Functional Features:
- Precise Control: High-resolution D/A conversion.
- Loop Power: Active or passive output configurations.
- Ramp Rate Limiting: Programmable output slew rates to prevent process upset.
- Open Loop Protection: Configurable safe-state output on module failure.
Application Scenarios:
- Control valve positioning.
- VFD speed control.
- Setpoint output to local controllers.
Performance Parameters:
- Output Resolution: 12-bit or higher.
- Accuracy: ±0.1% of span or better.
- Update Rate: Fast output updates for responsive control.
Material Composition & Structural Characteristics:
- Circuitry: Precision current sources and D/A converters.
- Isolation: Channel-to-channel and channel-to-backplane isolation.
Working Principle: The controller sends digital output values to the module. The module converts these to precise analog currents using internal D/A converters and current loop drivers. The output is continuously monitored and adjusted to maintain accuracy.
Installation Requirements:
- Wire to field devices observing polarity.
- Configure output range and fail-safe mode in software.
- Ensure adequate loop power supply.
Usage Precautions:
- Do not short-circuit active outputs.
- Verify load impedance is within module specifications.
- Test fail-safe outputs during commissioning.
