Overview
The Invensys FBM206, also cataloged as the FBM206 Pulse Input Module, operates as a dedicated hardware component for isolated pulse acquisition and analog output processing within Foxboro I/A Series control system platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | FBM206 |
| Brand | Invensys |
| Origin | USA |
| Weight | 0.3 kg |
| Dimensions | 4.5 x 11 x 11.5 cm (estimated shipping size) |
| Operating Temp | -40 to +70 deg C |
| Power Consumption | Not specified |
| Input Channels | 8 isolated independent pulse input channels |
| Pulse Input Frequency Range | 10 Hz to 25 kHz |
| Analog Output Channels | 4 isolated independent 0 to 20.4 mA DC analog output channels |
| Analog Output Load | 735 Ohms |
| Output Voltage | 18.6 V nominal at 20 mA DC at I/O field terminals |
| Linearity Error | +/- 0.025% of span (monotonic) |
| Accuracy | +/- 0.05% of span at 25 deg C |
| Temperature Coefficient | 100 ppm/deg C |
| Altitude Rating | -300 to +12,000 m (-1,000 to +40,000 ft) |
| Channel Configuration | Channel isolated 8 input, pulse |
DCS Signal Isolation and Pulse Processing
The FBM206 provides eight isolated pulse input channels for direct measurement of field pulse signals. Moreover, each input channel maintains electrical separation to reduce signal interference between field devices. The module accepts pulse frequencies from 10 Hz to 25 kHz, allowing it to process variable-frequency input signals from connected instruments.
In addition, the module integrates four isolated analog output channels that provide 0 to 20.4 mA DC current signals. The output circuit supports a 735 Ohm load and delivers 18.6 V nominal at 20 mA DC at the I/O field terminals. Therefore, the FBM206 supports combined pulse acquisition and current output functions within distributed control system configurations.
Frequently Asked Questions
Q: Does the FBM206 provide electrical isolation between input channels?
A: Yes. The FBM206 uses eight isolated independent pulse input channels to maintain channel separation and reduce electrical interference between field signals.
Q: What pulse frequency range can the FBM206 process?
A: The FBM206 accepts pulse input signals from 10 Hz to 25 kHz.
Q: What analog output signal does the FBM206 generate?
A: The module provides four isolated independent 0 to 20.4 mA DC analog output channels with a specified 735 Ohm output load capability.
Field Installation Guidelines
- Install the FBM206 in the designated Foxboro I/A Series fieldbus or I/O subsystem location according to system hardware documentation.
- Verify field wiring polarity before connecting pulse inputs and analog output terminals.
- Use shielded signal cables for pulse and analog circuits where electromagnetic interference may affect measurement accuracy.
- Connect cable shields according to the site grounding practice to prevent unwanted ground loops.
- Separate low-level pulse signal wiring from high-voltage power cables during cabinet installation.
- Confirm operating temperature, altitude, and environmental conditions before commissioning the module.
- Check channel isolation performance after wiring completion by validating individual field signal responses.
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