Foxboro FBM214B RH927AH HART Communication Input Module

Configured for analog signal acquisition and HART digital data pass-through in EcoStruxure Foxboro DCS platforms, the Foxboro FBM214B RH927AH (FBM214B HART Communication Input Module) provides direct physical/electrical execution.

Hardware Specifications

4-20 mA HART Loop Protocol & Channel-To-Channel Isolation

The FBM214B architecture incorporates high-density signal conversion with channel-to-channel isolation to prevent common-mode noise corruption and ground loop formation across distributed field loops. Designed with a nominal 61.5 Ohm sense resistor and total input resistance of 280 Ohm, the module transparently decouples superimposed HART digital FSK signals while delivering 15-bit conversion resolution at a 100 ms per channel update rate.

Frequently Asked Questions

Q: What is the primary functional difference between standard 4-20 mA inputs and the FBM214B RH927AH?

A: The FBM214B simultaneously processes standard 4-20 mA analog primary variables while maintaining continuous FSK digital communication with HART-compliant field transmitters for secondary variable monitoring and device diagnostics.

Q: Can the FBM214B input channels be hot-swapped while the DCS baseplate is powered?

A: Yes. The module features keyway insertion controls and staggered connector pins designed to enable live hot-swapping on active DCS baseplates without causing bus interruption or field loop surges.

Field Installation Guidelines

• Secure the module vertically into the dedicated baseplate slot until the locking mechanism engages to guarantee proper backplane connector contact.
• Ground all field cable shields at a single point at the terminal assembly to prevent ground loop interference.
• Maintain standard signal separation by routing 4-20 mA HART wiring away from high-voltage AC cables to limit noise coupling.
• Ensure ambient cabinet temperatures remain within -20 to +60 deg C to preserve measurement accuracy.