2AT-SBU Foxboro

2AT-SBU Foxboro Termination Unit

Product  Description：

Foxboro Termination Units, widely utilized within the EcoStruxure Foxboro DCS (Distributed Control System) architectures like the I/A Series, are specialized hardware interface assemblies designed to field-wire process equipment directly to the system's input/output (I/O) modules. These units act as the secure, organized termination point for field wiring, providing critical signal conditioning, circuit protection, and isolation before field data reaches the central control processors.

Product Parameters

The technical composition of a Foxboro Termination Unit centers on high-density connectivity, signal conditioning, and electrical safety thresholds:

• Terminal Density: Available in various channel distributions, most commonly supporting 8-channel, 16-channel, or 32-channel configurations to match corresponding I/O module capacities.

• Signal Compatibility: Configured for specific signal categories, including 4-20mA analog loops, low-voltage discrete inputs, high-voltage AC/DC digital signals, and thermocouple or RTD temperature signals.

• Field Wiring Gauge: Equipped with robust screw terminals or spring-clamp connectors that accommodate a wide wire range, typically from 22 AWG to 12 AWG.

• Insulation and Isolation Resistance: Built with advanced galvanic separation, often rated up to 1500V AC or higher, protecting the controller from field-side electrical surges.

• Fuse Protection: Features individual channel fuses, frequently rated at 250mA for analog loops, providing short-circuit protection for individual field devices.

• Environmental Resilience: Coated to withstand operating temperatures between -20°C and 70°C, and certified for Class 1, Division 2 hazardous locations.

Product Advantages

Foxboro Termination Units offer key system performance and engineering benefits for complex industrial control rooms:

• High-Density Space Optimization: The compact design allows hundreds of field wires to be terminated neatly within a single control cabinet enclosure, maximizing floor space.

• Enhanced System Maintenance: Individual channel fusing ensures that a field fault, such as a short-circuited sensor, only drops that specific loop without affecting the rest of the module.

• Clean Signal Conditioning: Onboard passive components help filter out high-frequency electromagnetic interference (EMI) and radio-frequency interference (RFI) from field lines, ensuring high data integrity.

• Simplified Field Wiring: Clear terminal labeling and distinct separation between field-side wiring and system-side ribbon cables simplify the initial installation and reduce errors.

• Rugged Design Lifecycle: Constructed using industrial-grade plastics and corrosion-resistant metal terminal strips to ensure decades of continuous operation without physical degradation.

Product Applications

These termination units are deployed globally as the physical gateway for field cabling across continuous process industries:

• Chemical and Petrochemical Processing: Managing connection points for thousands of control valves, flow meters, and pressure transmitters across large-scale chemical plants.

• Oil and Gas Facilities: Serving as the marshaling or termination hub for offshore platform instrumentation and long-distance pipeline monitoring sensors.

• Power Generation Stations: Handling the termination of temperature sensors, vibration monitors, and speed switches surrounding massive turbine generators.

• Pulp and Paper Mills: Connecting complex hydraulic actuators, level sensors, and motor run feedbacks to the central DCS in harsh, humid processing environments.

• Mining and Metals Processing: Organizing the heavy discrete and analog control lines necessary for automated conveyor networks, crushing units, and smelting furnaces.

Important Precautions

To preserve the electrical integrity of the system and prevent operational downtime, the following instructions must be followed:

• Strict Voltage Matching: Ensure the specific termination unit matches the voltage and signal type of the I/O module it feeds. Connecting an AC high-voltage field line to a low-voltage DC termination unit will destroy both the unit and the connected I/O card.

• Proper Shield Termination: Analog instrumentation shields must be terminated correctly at the designated shield bus on the unit, and grounded at only one end to prevent the formation of measurement-distorting ground loops.

• Fuse Replacement Ratings: When replacing a blown fuse, always use the exact amperage and speed rating specified by Foxboro. Over-fusing a channel removes the safety threshold and risks permanent damage to the internal PCB traces.

• Cable Strain Relief: Ensure that incoming field cables are properly supported by external cabinet conduits or trays. Direct physical hanging weight on the terminal blocks can loosen connections or crack the module housing over time.

• Secure Ribbon Cable Connections: The multi-pin system cables that link the termination unit to the I/O rack must be fully seated and locked with their retention clips to prevent intermittent communication dropouts in high-vibration control rooms.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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