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ABB TB840A 3BSE037760R1 Module Bus Trunk Modem.

1. Product Description

The ABB TB840A 3BSE037760R1 is a high-performance Module Bus Trunk Modem designed for ABB AC 800M Distributed Control Systems (DCS). It serves as a critical signal enhancement and transmission device in the module bus network, dedicated to extending the communication distance of the AC 800M backplane bus and improving signal integrity. By amplifying and regenerating weak module bus signals, it enables reliable data exchange between AC 800M processor units (e.g., PM851K01) and distributed I/O/communication modules (e.g., AI801, CI858K01) over longer distances. The device features industrial-grade signal processing circuits, compact DIN rail-mounted design, and seamless compatibility with the AC 800M module bus protocol, making it ideal for large-scale industrial control systems where modules are distributed across multiple cabinets or distant locations (e.g., large factories, power plants). It ensures stable, low-latency communication in complex bus networks, reducing signal attenuation and interference risks.

2. Detailed Parameters

Parameter Category	Specifications
Model Number	TB840A (Order Code: 3BSE037760R1)
Function Type	Module Bus Trunk Modem (signal amplification, regeneration, and long-distance transmission)
Supported Bus Protocol	ABB AC 800M Module Bus Protocol
Communication Distance	Extends module bus distance up to 100 meters (per modem); supports cascading of multiple modems for longer distances (max 500 meters with 5 cascaded units)
Signal Amplification Gain	20 dB (typical)
Data Transfer Rate	Up to 100 Mbps (matches AC 800M module bus rate)
Input/Output Interfaces	2 × Module Bus ports (compatible with AC 800M backplane connectors)
Power Supply	24 V DC (19.2-28.8 V DC); Typical power consumption: 3 W
Operating Temperature	-40°C to +70°C
Dimensions (W×H×D)	48.3 × 100 × 120 mm
Mounting Method	DIN rail mounting (compatible with standard 35 mm DIN rails, EN 50022)
Compatibility	ABB AC 800M series modules (PM851K01, AI801, DI801, CI858K01, etc.)
Certification	CE, UL, IEC 61000-6-2 (EMC immunity), IEC 60947-1 (industrial safety)

3. Advantages & Features

Extended Bus Distance: Amplifies and regenerates module bus signals to extend communication distance up to 100 meters per unit, and supports cascading for distances up to 500 meters—solving signal attenuation issues in large-scale DCS with distributed modules.

High-Speed & Low-Latency: Maintains 100 Mbps data transfer rate (matching the original module bus speed) and low signal delay (≤1 ms), ensuring real-time data exchange between processor units and distributed modules, critical for time-sensitive industrial processes.

Industrial-Grade Signal Stability: Equipped with anti-interference circuits (EMI filtering) and signal regeneration technology, it reduces noise and distortion in the bus network, ensuring stable communication even in harsh industrial environments with strong electromagnetic interference (e.g., near high-power motors, transformers).

Seamless AC 800M Integration: Designed specifically for the AC 800M module bus protocol, it requires no additional configuration (plug-and-play) and automatically adapts to the bus network—eliminating compatibility issues and simplifying deployment.

Compact & Durable Design: DIN rail-mounted compact structure saves control cabinet space; -40°C to +70°C operating temperature range and rugged housing adapt to extreme industrial conditions (e.g., petrochemical plants, steel mills).

4. Application Fields

Large-Scale Factory DCS: Used in factories with multiple control cabinets (e.g., automotive assembly plants, electronics manufacturing facilities) to connect distributed AC 800M I/O modules (e.g., AI801, DO801) to the central PM851K01 processor, extending the module bus across cabinets.

Power Generation Facilities: Applied in thermal power plants or nuclear power auxiliary systems to link distant modules (e.g., boiler room I/O modules, turbine control modules) to the central DCS processor, overcoming long-distance signal attenuation.

Petrochemical Complexes: Deployed in large petrochemical refineries where modules are distributed across different process units (e.g., distillation, catalytic cracking) to ensure stable communication between the central control room’s processor and on-site I/O/communication modules.

Water Treatment Plants: Used in large-scale wastewater treatment plants with scattered equipment (e.g., pump stations, aeration tanks) to connect distributed DI/DO modules (e.g., DI801, DO802) to the central AC 800M DCS, ensuring coordinated control of the entire treatment process.

5. Precautions

Cascading Limits: Do not exceed 5 cascaded units (max 500 meters); excessive cascading may increase signal delay and reduce network stability.

Power Supply Stability: Ensure the power supply voltage is within 19.2-28.8 V DC; use a regulated power supply to avoid voltage fluctuations that may damage the modem or disrupt signal transmission.

Interface Connection: Ensure secure connection of module bus ports to the AC 800M backplane (check for loose connectors); poor contact may cause intermittent communication failures.

Electromagnetic Interference Avoidance: Install the modem away from high-interference sources (e.g., high-voltage cables, motor control centers); use shielded cables for module bus connections if necessary to enhance anti-interference performance.

Environmental Protection: Install the modem in a dustproof, waterproof control cabinet (IP54 or higher) in humid, dusty, or corrosive environments (e.g., coastal petrochemical plants) to prevent damage to internal circuits from moisture, dust, or chemicals.

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