Honeywell CC-PFB801
Honeywell CC-PFB801
Honeywell CC-PFB801
Honeywell CC-PFB801
Honeywell CC-PFB801

Honeywell FC-IOBUS-CPIO2 | FSC Series I/O Bus Adapter for Safety Instrumented Systems

  • Brand: Honeywell
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    Model: FC-IOBUS-CPIO2
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    Product Type: I/O Bus Interface Module
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    Series: Fault Tolerant FSC (Fail-Safe Control)
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    Core Function: Provides redundant I/O bus interface for connecting FSC safety controllers to remote I/O modules, enabling reliable data exchange and power distribution in safety instrumented systems (SIS).
  • •
    Key Specs: Supports FSC proprietary bus protocol, dual-port redundant design, 24V DC power input, -40°C to +70°C operating temperature, SIL 3 certified.
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Part number: Honeywell FC-IOBUS-CPIO2
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Description

FC-IOBUS-CPIO2: Product Overview
The FC-IOBUS-CPIO2 is a compact I/O bus interface module engineered for Honeywell’s Fault Tolerant FSC (Fail-Safe Control) safety instrumented systems (SIS). It serves as a critical communication backbone, bridging FSC safety controllers (e.g., FSC-101, FSC-102) with remote I/O modules (e.g., digital/analog I/O, communication adapters) in distributed safety architectures. Its primary role is to manage redundant data transmission and power distribution across the I/O bus, ensuring uninterrupted communication between the controller and field devices—essential for emergency shutdown (ESD), fire/gas detection, and process interlock systems where single-point failures pose severe safety risks.
Functionally, the module implements Honeywell’s proprietary FSC bus protocol, supporting dual-port redundant communication (ring/star topology) with automatic failover (≤20ms transfer time). It processes both control signals (e.g., trip commands, status updates) and diagnostic data (e.g., I/O module health, bus integrity), while providing isolated 24V DC power to remote I/O racks. As part of the FSC series, the FC-IOBUS-CPIO2 inherits the platform’s focus on fault tolerance (hardware fault tolerance ≥1), compliance with IEC 61508 (SIL 3), and seamless integration with FSC engineering tools (e.g., FSC Workbench). This design is ideal for industries like oil & gas, chemicals, and power generation, where safety system reliability directly impacts asset protection and regulatory adherence.

Honeywell CC-PFB801

Honeywell CC-PFB801

FC-IOBUS-CPIO2: Technical Specifications
  • •
    Model Number: FC-IOBUS-CPIO2
  • •
    Manufacturer: Honeywell
  • •
    Product Type: I/O Bus Interface Module
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    Bus Protocol: FSC proprietary (supports FSC-101/102 controller communication)
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    Number of Ports: 2 (redundant, RS-485 compatible)
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    Redundancy Architecture: Dual-port automatic failover (ring/star topology)
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    Isolation Voltage: 1500VAC (port-to-bus, port-to-ground)
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    Operating Temperature: -40°C to +70°C
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    Power Supply: 24V DC (nominal, 18-30V DC range) from FSC chassis
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    Power Consumption: 4W (typical, dual ports active)
  • •
    Certifications: SIL 3 (IEC 61508), CE, UL, cUL, ATEX Zone 2 (optional)
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    Dimensions: 100mm x 80mm x 45mm (width x height x depth, compact DIN-rail mount)
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    Weight: 0.35kg
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    Hot Swap Support: Yes (plug-and-play replacement without system shutdown)
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    Diagnostics: Bus status (link/activity), port fault, power monitoring, redundancy state

    Honeywell CC-PFB801

    Honeywell CC-PFB801

Core Features & Customer Value​
Dual-Port Redundancy Ensures Uninterrupted Communication: The FC-IOBUS-CPIO2’s redundant port design automatically switches to a secondary path if the primary bus fails (e.g., cable break, connector fault), with a 20ms transfer time that meets SIL 3 requirements for safety functions. For engineers, this eliminates single-point communication failures in critical systems like offshore platform ESD, where downtime could lead to hydrocarbon releases. Maintenance teams benefit from reduced troubleshooting—no manual reconfiguration is needed after a port failure.
Galvanic Isolation Protects Against Electrical Noise: With 1500VAC isolation between ports and the FSC bus, the module prevents ground loops and EMI from industrial equipment (e.g., VFDs, motors) from corrupting data. In a chemical plant’s reactor safety system, this ensures reliable transmission of trip commands to remote shutdown valves, even near high-power agitators.
Compact Design Optimizes Cabinet Space: Measuring 100x80x45mm, the module minimizes footprint in control cabinets—critical for retrofits with limited space. For procurement managers, this reduces panel size by 30% compared to bulkier legacy interfaces, cutting material and installation costs.
Hot-Swappable Architecture Minimizes Downtime: The module can be replaced while the system remains powered, a key feature for continuous processes like oil refining. Technicians simply remove the faulty unit and insert a new one; the FSC controller automatically re-establishes bus communication. This avoids scheduled shutdowns for maintenance, saving thousands in lost production per incident.
SIL 3 Certification for Highest Safety Integrity: Certified to SIL 3 (IEC 61508) with a probability of failure per hour (PFDavg) <1E-9, the FC-IOBUS-CPIO2 is suitable for the most critical safety functions (e.g., reactor overtemperature shutdown, flare system activation). Its fault-tolerant design aligns with audit requirements for OSHA 1910.119 and API 14C, reducing compliance risks.
Typical Applications​
The FC-IOBUS-CPIO2 is deployed in safety-critical systems requiring redundant I/O communication. In a petroleum refinery’s catalytic reformer, it connects an FSC-102 controller to 3 remote I/O racks (each with 16 digital inputs for emergency stops, 8 analog outputs for valve control). The dual-port redundancy ensures communication continuity if a cable is damaged during maintenance, preventing accidental reactor startup.
At a chemical plant’s ethylene cracker, the module interfaces with FSC safety controllers and remote fire/gas detectors (via I/O adapters). Its -40°C cold-start capability supports outdoor installations near the cracker, while SIL 3 certification validates its use in NFPA 72-compliant fire suppression interlocks.
In a coal-fired power plant’s boiler protection system, the FC-IOBUS-CPIO2 links the FSC controller to remote I/O modules monitoring drum level switches and soot blower interlocks. Hot-swap support allows technicians to replace a faulty module during a planned outage, avoiding boiler shutdown.

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