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Foxboro FBM204 Analog Input Module
Foxboro FBM204 module available in Brand New condition with Original Stock. Global Shipping provided for industrial process control infrastructure.
Description
Configured for 4-20 mA analog signal processing in Foxboro I/A Series DCS platforms, the Foxboro FBM204 (FBM204 Analog Input Module) provides direct physical/electrical execution. This 4-channel input interface accepts 0-20 mA or 4-20 mA current loop signals from field transmitters, converting analog field data into digital values for high-speed backplane bus transmission. The unit features built-in signal conditioning and channel isolation to prevent ground loops across field instrumentation loops.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | FBM204 |
| Brand | Foxboro |
| Origin | USA |
| Weight | 0.28 kg |
| Dimensions | 114 mm x 45 mm x 105 mm |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | 3.0 W maximum |
| Input Channels | 4 isolated analog input channels |
| Input Range | 0 to 20 mA DC or 4 to 20 mA DC |
| Resolution | 15 bits plus sign |
| Channel-to-Channel Isolation | 263 VAC continuous, 1500 VAC for 60 seconds |
| Accuracy | +/- 0.05% of full scale at 25 deg C |
Channel Isolation and HART Signal Loop Interface
The module utilizes galvanic isolation architecture between individual channels as well as between field circuitry and the internal system backplane. This design suppresses common-mode voltages and prevents channel-to-channel crosstalk in harsh electrical environments. Integrated signal conditioning circuitry delivers high noise rejection ratios across standard 4-20 mA process loops, ensuring analog-to-digital conversion fidelity without external isolation amplifiers.
Frequently Asked Questions
Q: Does the module support hot-swapping under powered backplane conditions?
A: Yes, the unit is hot-swappable and can be inserted or removed from the baseplate without interrupting power or communication on adjacent operational I/O modules.
Q: What are the primary grounding requirements for the 4-20 mA field loop wiring?
A: Field cable shields must be tied to a single point ground at the baseplate terminal block to prevent ground current loops from introducing offset errors into the analog signal path.
Field Installation Guidelines
- Mount the baseplate securely to the DIN rail or enclosure rack prior to module insertion.
- Verify that field wiring terminal blocks match the channel layout defined in the system wiring diagram.
- Align the module keying pins with the baseplate socket to prevent bent connector pins during insertion.
- Press the module firmly into the baseplate until the mounting latches fully engage.
- Connect field wiring shields to the designated earth ground bus, maintaining continuous shielding up to the sensor junction box.
Additional information
| Weight | 0.28 kg |
|---|---|
| Dimensions | 64 × 72 × 43 mm |
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