Primary Use: Enabling SBUS communication between Experion PKS C-Series I/O racks and distributed I/O modules; facilitating data transfer for process control loops
Manufacturer: Honeywell Part number: Honeywell 12-SBUS
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12-SBUS: Product OverviewThe 12-SBUS is a serial bus interface module engineered for Honeywell’s ControlEdge™ C300 distributed control system (DCS) and safety instrumented systems (SIS). It serves as a critical communication backbone, bridging C300 controllers with remote I/O modules (e.g., digital/analog I/O, communication adapters) in distributed architectures. Its primary role is to manage redundant data transmission and power distribution across the SBUS, ensuring uninterrupted communication between the controller and field devices—essential for applications where single-point failures could compromise process safety or uptime, such as emergency shutdowns, fire/gas detection, and equipment interlocks.Functionally, the module implements Honeywell’s proprietary SBUS protocol, supporting dual-port redundant communication (ring/star topology) with automatic failover (≤20ms transfer time). It processes 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 ControlEdge C300 family, the 12-SBUS integrates with the platform’s high-speed I/O link, hot-swappable architecture, and unified engineering tools (ControlEdge Builder), simplifying configuration and maintenance. This design aligns with compliance to IEC 61508 (SIL 2) and industrial standards, making it suitable for continuous process industries like oil & gas, chemicals, and power generation.
Honeywell 12-SBUS
12-SBUS: Technical Specifications
• Model Number: 12-SBUS
• Manufacturer: Honeywell
• Product Type: Serial Bus Interface Module
• Bus Protocol: Honeywell SBUS (proprietary, for C300 controller-remote I/O communication)
• Number of Ports: 2 (redundant, RS-485 compatible)
• Power Supply: 24V DC (nominal, 18-30V DC range) from C300 chassis
• Power Consumption: 3.8W (typical, dual ports active)
• Certifications: SIL 2 (IEC 61508), CE, UL, ATEX Zone 2 (optional)
• Dimensions: 25mm x 128mm x 115mm (width x height x depth, fits C300 I/O slot)
• Weight: 0.22kg
• Hot Swap Support: Yes (plug-and-play replacement without system shutdown)
• Diagnostics: Bus status (link/activity), port fault, power monitoring, redundancy state
Honeywell 12-SBUS
Core Features & Customer ValueDual-Port Redundancy Ensures Uninterrupted Communication: The 12-SBUS’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 2 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 C300 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.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 C300 controller automatically re-establishes bus communication. This avoids scheduled shutdowns for maintenance, saving thousands in lost production per incident.Seamless Integration with ControlEdge Ecosystem: As a native C300 I/O component, the 12-SBUS is configured via ControlEdge Builder, which auto-detects remote I/O profiles for plug-and-play setup. This reduces engineering time by 30% compared to third-party gateways. For a water treatment plant upgrading its DCS, reuse of existing SBUS remote I/O with the 12-SBUS avoids costly hardware replacements.SIL 2 Certification for Safety-Critical Applications: Certified to SIL 2 (IEC 61508) with a probability of failure per hour (PFDavg) <1E-8, the 12-SBUS is suitable for safety functions like remote pressure interlock monitoring. Its fault-tolerant design aligns with audit requirements for API 556 and ISO 10418, reducing compliance risks.Typical ApplicationsThe 12-SBUS is deployed in safety-critical systems requiring redundant SBUS communication. In a petroleum refinery’s catalytic reformer, it connects a C300 controller to 4 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 C300 safety controllers and remote fire/gas detectors (via SBUS I/O adapters). Its -40°C cold-start capability supports outdoor installations near the cracker, while SIL 2 certification validates its use in NFPA 72-compliant fire suppression interlocks.In a coal-fired power plant’s boiler protection system, the 12-SBUS links the C300 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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