Product Overview

The Honeywell CC-TFB811 (PN: 51308311-175) is a 4-port Redundant FOUNDATION Fieldbus IOTA for the Experion PKS Series C platform. It serves as the mounting base for a redundant pair of CC-PFB401 FIM4 modules, enabling reliable H1 segment communication.

Each port supports multiple field devices on a single pair of wires, and the IOTA ensures continuous digital communication even if one module fails. The -175 G3 coating protects against corrosive industrial environments.

Technical Data

Key Features:

• Redundant Digital Architecture: Primary/secondary module pair ensures bumpless switchover.

• Integrated Termination: Software-selectable terminators reduce external hardware.

• Power Conditioning Interface: Acts as clean injection point for fieldbus DC power.

• Diagnostic Transparency: Passes H1 diagnostics for predictive maintenance via Experion FDM.

Typical Applications

• Refining & Petrochemical: High-density instrument clusters on distillation columns or reactor skids.

• Upstream Gas Processing: Multivariable transmitters over long H1 segments.

• Pharmaceutical Production: Digital backbone for precise dosing and regulatory compliance.

• Power Generation: Interfacing with smart actuators and boiler sensors for optimized combustion.

FAQ

Q1: Can I use the CC-TFB811 without redundancy?
A1: Yes, a single CC-PFB401 module can be used. For non-redundant applications, the CC-TFB401 (6-inch) is recommended.

Q2: How many devices per segment?
A2: While H1 supports up to 32 devices, 16 devices per segment is typical for Series C FIM4 to maintain bandwidth for COF and alarm reporting.

Q3: Does this IOTA provide power to field devices?
A3: It passes power but requires an external Fieldbus Power Conditioner (24–32 VDC) for proper injection without affecting digital signals.

Q4: Is the -175 suitable for corrosive environments?
A4: Yes. The G3 conformal coating protects against corrosion from sulfur or chlorine.