FOXBORO FBM211 RH914TN Input Interface Module

The Foxboro FBM211 RH914TN, also cataloged as the FBM211 0 to 20 mA Input Interface Module, operates as a dedicated hardware component for 20 mA DC analog input processing within Foxboro I/A Series platforms.

Hardware Specifications

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

The FBM211 RH914TN architecture provides sixteen isolated analog input channels designed to accept 2-wire analog sensors and self-powered 20 mA current loops. Each channel features galvanic isolation from earth ground and internal module logic, eliminating ground loops and suppressing high common-mode voltages to preserve signal integrity during 4-20 mA current loop conversion across process control networks.

Frequently Asked Questions

Q: What sensor types can be wired directly to the FBM211 RH914TN input channels?

A: The module accepts both 2-wire 4 to 20 mA loop-powered transmitters and self-powered 20 mA analog signal sources across its 16 input channels.

Q: How does galvanic isolation function on the FBM211 RH914TN module?

A: Each individual channel is galvanically isolated from ground and module logic to prevent electrical noise coupling, signal corruption, and ground loop current flow.

Field Installation Guidelines

• Verify that operating voltage is maintained at 24 VDC prior to energizing the module field wiring connections.
• Ground all field cable shield drain wires at a single termination point at the baseplate to prevent stray noise interference.
• Route analog field signal lines away from high-voltage AC lines to minimize electromagnetic noise coupling.
• Maintain ambient control enclosure temperatures within the rated -40 to +85 deg C operating limit.