P0917XQ | FOXBORO FBM216 Communication Redundant Input Interface Module

The FOXBORO FBM216 P0917XQ, also cataloged as the FBM216 Communication Redundant Input Interface Module, operates as a dedicated hardware component for managing HART protocol signal acquisition within I/A Series distributed control system platforms.

Hardware Specifications

Process Control: HART Loop Protocol and Isolation

The FBM216 module facilitates bi-directional communication with intelligent field devices via the 4-20 mA HART loop protocol. Each of the eight group-isolated channels is engineered to support master/slave, asynchronous, half-duplex data transmission. To ensure measurement precision, the module incorporates a 61.9 Ohm nominal sense resistor, resulting in a total minimum input resistance of 280 Ohm. Signal integrity is maintained through a combination of parity checks and cyclic redundancy check (CRC) bytes for every data frame, while providing a common-mode rejection ratio exceeding 100 dB at 50/60 Hz to minimize the impact of industrial electrical noise.

Frequently Asked Questions

Q: What is the maximum permissible distance between the FBM216 and a connected field device?

A: The FBM216 adheres to the HART FSK physical layer specification HCF_SPEC-54 (Revision 8.1), supporting a maximum cable run of up to 3030 m (10000 ft), provided the loop impedance constraints are maintained.

Q: How does the module handle signal updates in the control database?

A: The module executes signal acquisition at a rate of 2 messages per second with a 100 ms update rate and a 500 ms integration time. The fastest allowed execution control block (ECB) period is 500 ms.

Field Installation Guidelines

• Mounting: Ensure the FBM216 is inserted into a compatible 200 Series baseplate. Secure the module using the integrated mounting lugs to maintain a height clearance of 114 mm within the cabinet.
• Termination: Use the appropriate termination assembly (TA) based on the site-specific cabling requirements. The compression style TA weighs 181 g, while the ring lug style TA weighs 249 g.
• Grounding: Verify that all cable shields for HART-enabled loops are terminated to a clean instrument ground at the TA to prevent noise injection. Ensure the compliance voltage of 18 VDC minimum at 20.5 mA is verified at the device terminals to guarantee successful digital-to-analog communication.