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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Output Channels | 8 channel-isolated |
| Output Signal | 4–20 mA analog or HART FSK superimposed on 4–20 mA |
| HART Protocol Support | Versions 5, 6, or 7 |
| Communication | Point-to-point, master/slave, half-duplex, 1200 baud |
| Message Rate | 2 messages per second |
| Analog Accuracy (incl. linearity) | ±0.05 % of span (4–20 mA) |
| Resolution | 13 bits |
| Maximum Output Load | 750 Ω |
| Maximum Rate of Change | 20 mA in 60 ms |
| Isolation | Channel-to-channel, channel-to-ground, and module logic |
| Loop Power | Isolated power supply per channel |
| Power Supply | 24 V DC +5 % / –10 % (redundant capable) |
| Power Consumption | 7 W maximum |
| Operating Temperature | –20 to +70 °C (module) |
| Relative Humidity | 5 to 95 % non-condensing |
| Weight | Approx. 0.32 kg |
| Mounting | Modular baseplate (DIN rail or rack) |
4. Product Introduction
The Foxboro FBM215 is an 8-channel HART Communication Output Interface Module for the I/A Series and Foxboro Evo DCS. Each channel delivers a standard 4–20 mA analog control signal or a HART Frequency Shift Keying signal superimposed on the analog current. A dedicated FSK modem on every channel enables bi-directional digital communication with HART field devices at two messages per second.
This module is used when both precise analog actuation and HART device diagnostics or configuration are required from the same output channels. Full channel-to-channel isolation, per-channel isolated power, and support for universal, common-practice, and device-specific HART commands make it a direct interface for smart valve positioners, I/P converters, and other HART actuators.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No output current / channel reads 0 mA | Open field wiring, open load, or module not enabled | ✅ High | Measure current at TA terminals with multimeter in series; verify output command in control software | Confirm field device load is within 750 Ω and wiring continuity |
| Analog output OK but no HART communication | Device not HART-capable, address not 0, or cable issues | ✅ High | Confirm device HART version and address; check for CRC errors in diagnostic buffer | Set device to point-to-point address 0; verify cable length and capacitance limits |
| Output stuck at last value or fail-safe | Module in fail-safe mode or communication loss to Control Processor | ✅ Medium | Check module status LEDs and Fieldbus health; review ECB configuration | Verify Fieldbus path and module configuration; restore communication before forcing output |
| Output current higher or lower than commanded | Incorrect scaling in control block or load resistance out of range | ✅ Medium | Compare commanded value vs. measured current at terminals | Check ROUT or equivalent block scaling; measure actual loop resistance |
| Intermittent HART timeouts | Excessive noise, poor shielding, or ECB period too aggressive | ✅ Medium | Inspect shield grounding (prefer single-point); review system diagnostic log | Improve cable routing; increase ECB period if system loading is high |
| Module status LED indicates fault | Baseplate power or Fieldbus problem | ❌ Low | Measure 24 V DC at baseplate; check adjacent modules | Resolve power or Fieldbus issue before replacing the FBM215 |
If the above checks do not resolve the issue, capture photos of the module front, TA terminals, and a system diagnostic log, then contact technical support.
- FBM215
- FBM215
6. Frequently Asked Questions (FAQ)
Q: What is the difference between FBM215 and FBM218? A: FBM215 is a non-redundant, single module with eight channel-isolated HART outputs. FBM218 is the redundant version used in pairs with a redundant adapter for higher availability applications.
Q: Does each channel have its own isolated power supply? A: Yes. The provides an isolated, current-limited, voltage-regulated power supply for every output channel. This supports both 2-wire and 4-wire HART devices within the specified load limits.
Q: Can I mix standard 4–20 mA and HART devices on the same module? A: Yes. Any combination of conventional 4–20 mA actuators and HART devices is supported on the eight channels. HART communication occurs only on channels connected to HART-capable devices.
Q: Does the support HART burst mode? A: No. It operates in point-to-point mode only and supports universal, common-practice, and device-specific commands. Burst mode is not implemented.
Q: What termination assembly is required? A: Compatible compression or ring-lug termination assemblies for /218 (examples include P0917XV / P0926EK families). Always match the exact TA part number to your existing installation and verify cable type (typically Type 1).
Q: Is this module compatible with current Foxboro Evo systems? A: Yes. It is supported on I/A Series software (appropriate revisions) and Foxboro Evo Control Core Services v9.0 and later. Confirm the exact system software version before installation.
Q: Why are surplus units priced lower than factory-new listings? A: Most available stock is New Surplus—never installed, from excess project inventory. Units are inspected for physical condition. A 1-year warranty is supplied; the original OEM warranty does not transfer with surplus material.
