ABB TB820 3BSE008555R1 Module Bus Cluster Modem

The ABB TB820 3BSE008555R1 is a Module Bus Cluster Modem, designed as a communication interface for ABB’s Advant Controller 800xA or AC 800M automation systems. It plays a crucial role in managing and isolating communication between different clusters of I/O modules in complex distributed control environments.

TB820 enables communication between separate I/O clusters using the ModuleBus, which allows for extended I/O segment configurations over longer distances without signal degradation. It connects to another TB820 via twisted pair cables and supports long-distance communication using RS-485 transmission. One module operates as a master and the other as a slave, ensuring safe and reliable bidirectional data exchange.

This device is indispensable in automation systems where I/O modularity, flexibility, and long-distance data communication are necessary, especially in geographically distributed installations such as oil platforms, large manufacturing plants, or utility substations.

Product Specifications

Product Applications

The ABB TB820 is specifically designed for use in distributed industrial automation systems that require segmented I/O clusters. Applications include:

• Distributed Control Systems (DCS)

  Forms part of the ABB 800xA platform for I/O segment extension across large facilities.

• Oil & Gas Installations

  Extends I/O connectivity across platforms or remote rigs where distance is critical.

• Chemical and Petrochemical Plants

  Links remote I/O enclosures in explosion-prone zones while maintaining system integrity.

• Water Treatment Facilities

  Facilitates communication between remote field panels and control rooms.

• Power Generation & Distribution

  Connects modular systems over substations and generator units.

• Manufacturing Automation Lines

  Allows flexible placement of control hardware across production areas.

Product Advantages

• Extended Communication Range

  Supports up to 200 meters of I/O distribution using RS-485, perfect for large plants.

• Modular and Scalable

  Enables segmentation of ModuleBus networks without compromising system integrity.

• Reliable and Safe

  Galvanic isolation protects critical control signals and improves safety.

• Compact Design

  Slim footprint ensures minimal space usage on DIN rail installations.

• Plug-and-Play Integration

  Seamlessly connects with other ABB AC 800M modules and controllers.

• LED Diagnostics

  Easy status monitoring through onboard LED indicators.

• Low Power Consumption

  Efficient design draws minimal power from the ModuleBus.

• Industrial Grade Durability

  Designed to withstand harsh environments and fluctuating conditions.

• Certified for Hazardous Areas

  Suitable for installation in ATEX Zone 2 with the appropriate enclosure.

• ABB 800xA Ecosystem Compatible

  Fully supported by ABB’s engineering tools and DCS software.

Frequently Asked Questions (FAQ)

1. What is the function of the TB820 module?

   It serves as a modem for connecting and isolating separate ModuleBus segments.

2. Can TB820 be used over long distances?

   Yes, it supports RS-485 communication over up to 200 meters with twisted pair cabling.

3. Does the module require an external power supply?

   No, it receives power directly from the ModuleBus.

4. What is the difference between the master and slave TB820?

   One acts as the master (initiator), and the other as the slave (responder) in a pair.

5. Can TB820 be installed in hazardous areas?

   Yes, with suitable protection and enclosures, it complies with ATEX Zone 2.

6. How is the module mounted?

   It is DIN rail mounted inside control panels or field enclosures.

7. Is the communication galvanically isolated?

   Yes, it provides galvanic isolation between communication paths for safety.

8. Does the TB820 have diagnostics features?

   Yes, it has LED indicators for communication and module status.

9. Can this module be used in non-ABB systems?

   It is specifically designed for ABB AC 800M and 800xA systems and may not function properly outside these environments.

10. What happens if the TB820 fails?

    The loss of communication between I/O clusters would trigger diagnostics; redundancy or quick replacement is recommended.