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ABB SPA-ZC 21BB Bus Connection Module  

1. Key Parameters

• Product Model: SPA-ZC 21BB (standard identifier for the SPA series bus connection module)
• Core Function: Bus segment extension, branching, and signal amplification; ensures impedance matching for reliable data transmission
• Supported Bus Protocols: Optimized for ABB SPA bus (proprietary industrial bus protocol for SPA series automation systems)
• Bus Transmission Rate: Up to 1Mbps (deterministic real-time communication for industrial control)
• Maximum Bus Segment Extension: Up to 100 meters per segment (using shielded twisted-pair cables); supports cascading of multiple modules for longer distances
• Number of Bus Ports: 2× bus ports (for in/out segment connection); 1× auxiliary port (for local device connection, optional)
• Impedance Matching: Built-in 120Ω terminal resistor (configurable via DIP switch) to prevent signal reflection at bus endpoints
• Isolation Level: 2.5kVrms (bus ports to power supply; bus ports to auxiliary circuits)
• Power Supply: 24V DC (±10% tolerance); Typical power consumption: ≤3W
• Operating Temperature Range: -20℃~+60℃ (-4℉~140℉)
• Storage Temperature Range: -40℃~+85℃ (-40℉~185℉)
• Mounting Method: 35mm standard DIN rail mounting (compatible with industrial control cabinets)
• Protection Class: IP20 (module body); Complies with IEC 61010-1 (safety), IEC 61000-6-2 (EMC immunity)

2. Product Features

• Reliable Bus Extension: Amplifies bus signals to extend transmission distance up to 100 meters per segment, addressing signal attenuation issues in large-scale automation systems (e.g., factory-wide I/O networks).
• Built-In Impedance Matching: Configurable 120Ω terminal resistor eliminates signal reflection at bus endpoints, ensuring stable data transmission even in high-noise industrial environments.
• Galvanic Isolation: 2.5kVrms isolation between bus ports and power supply prevents ground loops and cross-interference from other electrical equipment (e.g., motors, frequency converters), reducing communication errors.
• Compact Design: Slim DIN rail-mounted profile saves control cabinet space, allowing high-density installation alongside other SPA series modules (e.g., I/O modules, controllers).
• Easy Configuration: No software programming required; impedance matching is set via a simple DIP switch, and LED indicators (power, bus status) provide real-time visual feedback for quick troubleshooting.
• Industrial Durability: Flame-retardant thermoplastic housing (UL94 V-0 rating) and anti-vibration design (compliant with IEC 60068-2-6) withstand dusty, humid, or vibration-prone conditions in manufacturing and process plants.
• Seamless SPA Series Integration: Tailored for ABB SPA automation systems, ensuring compatibility with SPA controllers, I/O modules, and field devices—simplifying system design and commissioning.

3. Application Fields

• Manufacturing Automation: Extends SPA bus segments to connect distributed I/O modules (e.g., DI/DO modules for sensor/actuator control) across large production lines (e.g., automotive assembly, electronics manufacturing).
• Process Industry: Links SPA series controllers to remote I/O stations in chemical plants, oil refineries, and pharmaceutical facilities—enabling real-time data transmission for process monitoring and control.
• Industrial Machinery: Connects bus segments for control panels of large machinery (e.g., CNC machines, packaging lines), ensuring reliable communication between local and remote control components.
• Infrastructure Projects: Extends bus networks in smart factories, industrial parks, and water treatment plants—integrating scattered control points into a unified automation system.
• Energy Sector: Used in power distribution automation systems to connect SPA-based monitoring devices (e.g., current transformers, voltage sensors) to central control units, ensuring stable data collection.

4. Precautions

• Bus Protocol Compatibility: Ensure the module is used exclusively with ABB SPA bus systems; it is not compatible with other industrial bus protocols (e.g., Profibus, Modbus), which will cause communication failures.
• Cable Selection: Use ABB-recommended shielded twisted-pair cables for bus connections; unshielded or low-quality cables will increase EMI susceptibility and signal loss.
• Impedance Matching Setup: Activate the 120Ω terminal resistor only at the two endpoints of the bus segment; enabling it in mid-segment modules will cause signal distortion.
• Power Supply Stability: Use a regulated 24V DC power supply with surge protection to avoid voltage fluctuations that may disrupt bus communication or damage the module.
• Environmental Limits: Do not operate outside the specified temperature range (-20℃~+60℃); install in a ventilated control cabinet to prevent overheating, especially in high-temperature industrial environments.
• Wiring Safety: Disconnect the bus power supply before installing or replacing the module to avoid transient voltage spikes that may damage connected devices; ensure proper grounding of cable shields (single-point grounding) to minimize interference

The structure and details of the product：

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