Description

The Honeywell CC-TFB811 51306751-175 is a redundant Fieldbus Interface Module Input/Output Termination Assembly (FIM8 IOTA) designed for the Honeywell Experion PKS Series C process control system platform. It serves as the physical mounting and signal termination base for Series C Fieldbus Interface Modules (FIM8), providing power distribution, Fault Tolerant Ethernet (FTE) network connections, and direct field wiring landings for up to 8 FOUNDATION Fieldbus H1 links.

As a conformal-coated 12-inch IOTA carrier board, the CC-TFB811 (Part Number 51306751-175) supports both redundant and non-redundant hardware topologies. In redundant applications, two FIM8 modules mount onto the upper and lower module positions on the assembly. In non-redundant setups, a single FIM8 module is installed in the upper module slot while the lower slot remains unpopulated. The assembly routes FTE A and FTE B network signals via Control Firewall (CF9) connections directly to the installed interface modules.

Built for harsh industrial automation environments, the conformal coating protects onboard electrical components against environmental contaminants, moisture, and corrosive atmospheric conditions. The module platform supports removal and insertion under power (RIUP), enabling module servicing without disrupting field device communication or process control operations.

Features

• 8-Link H1 Fieldbus Termination: Accommodates field wiring termination for up to 8 FOUNDATION Fieldbus H1 communications links per assembly.
• Dual Topology Compatibility: Operates in redundant mode with upper and lower FIM8 module slots, or in non-redundant mode using the upper module position.
• Conformal Coated Protection: Features factory conformal coating to withstand harsh industrial and atmospheric conditions.
• Fault Tolerant Ethernet Integration: Provides dual FTE network interface connectors (FTE A and FTE B) for high-availability Control Firewall (CF9) system interconnections.
• Live Insertion & Removal (RIUP): Supports insertion and removal of Series C FIM modules under power for seamless online maintenance.
• Integrated Power Conditioning Support: Designed with dedicated connection headers for optional redundant power conditioner IOTA assemblies (J17 and J18).

Applications

• Experion PKS Series C Architecture: Interfaces FOUNDATION Fieldbus H1 networks directly into the Honeywell C300/FIM control infrastructure.
• Process Instrumentation Networks: Provides signal routing and power distribution landings for field transmitters, control valves, and fieldbus positioners across 8 H1 links.
• High-Availability Fieldbus Systems: Serves as the base for redundant FIM8 controller configurations in mission-critical process plants.

Technical Specifications

General

Mechanical & Installation

Fieldbus & Electrical Ratings

Connections / Interfaces

Installation Guidelines

1. Pre-Installation Checks: Verify the Carrier Channel Assembly (CCA) is properly mounted in the cabinet, Series C power supply is installed, and Control Firewalls (CF9s) are operational.
2. Mounting Orientation: Align mounting holes of the IOTA with the screw locations on the CCA. Ensure the component side of the board faces upward.
3. Hardware Alignment: Insert supplied spacers and washers between the bottom of the IOTA board and the top of the CCA. When securing a redundant IOTA, install mounting screws on one side first, then install screws on the opposite side.
4. Screw Tightening Caution: Do not fully tighten the IOTA mounting screws before installing and tightening the screws in the 24V+ and COM terminals to keep the power screws from binding during installation.
5. Protective Grounding: Ensure the enclosure connects to protective earth ground using #8 AWG solid copper wire, making solid contact between the grounding bus bar, enclosure, and carrier.
6. Network Connections: Connect the yellow FTE cable from Control Firewall (CF9) to the FTE A connector and the green FTE cable to the FTE B connector.
7. Fieldbus Wiring: Connect positive (+) leads to terminal pin 1 and negative (-) leads to terminal pin 2 for each FFLINK connector (J2–J5 and J13–J16) observing strict polarity. Connect all cable shields to the cabinet field wiring shield landing bus bar.

Commissioning and Replacement

Commissioning Recommendations

1. FTE Cabling Verification: Verify color-coded network cables match connector assignments (Yellow to FTE A, Green to FTE B) for both upper and lower module positions.
2. Shield Grounding Check: Ensure all Fieldbus H1 cable shields are landed cleanly on the cabinet shield bus bar rather than floating.
3. Power Conditioner Integration: If using external power conditioning IOTAs, verify interconnection cables are secured to J17 and J18 prior to powering up field links.

Replacement Considerations

1. Online FIM Module Swap: The Series C FIM8 module supports removal and insertion under power (RIUP) on the IOTA carrier. Maintain standard safety procedures when servicing powered equipment.
2. Non-Redundant Module Slot: When replacing or configuring a single non-redundant FIM8 module, always ensure the module is inserted into the upper slot; the lower slot remains unused.