TB840A ABB PLC module

Description

TB840A ABB PLC module

Product Dimensions：

Product Description

The ABB TB840A (Part No: 3BSE021437R1) is a specialized ModuleBus Cluster Modem designed for the S800 I/O system. It serves as a key communication link between the CI801, CI810, or CI840 Fieldbus Communication Interface (FCI) and the S800 I/O modules when they are arranged in remote clusters.

Product Parameters

The TB840A is part of the ABB S800 I/O hardware family, providing high-speed optical and electrical communication.

Key Product Advantages

• Distance Expansion: Allows the S800 I/O modules to be placed far from the controller (up to 15 meters using Plastic Optical Fiber or up to 200 meters using HCS fiber).

• High Noise Immunity: By using fiber optic communication between I/O clusters, the system becomes immune to electromagnetic interference (EMI) and electrical noise.

• Redundancy Support: The TB840A supports redundant ModuleBus configurations, ensuring that a single cable break or modem failure does not shut down the entire I/O station.

• Galvanic Isolation: Provides complete electrical isolation between different I/O clusters, protecting the main controller from field-side faults.

• Hot-Swappable: Designed for high-availability systems, the module can be replaced while the system is powered (when used with the appropriate MTU).

Product Applications

The TB840A is essential in large-scale industrial control systems using ABB 800xA or Advant controllers:

• Distributed Control Systems (DCS): Connecting remote I/O racks in separate cabinets across a factory floor.

• Oil & Gas Refineries: Extending I/O reach in large plant areas where long-distance, noise-free communication is required.

• Power Generation: Monitoring auxiliary systems where electrical isolation between high-voltage areas and the control room is critical.

• Water Treatment: Managing widely distributed pump stations and sensors.

Important Usage Notes (Precautions)

• Fiber Optic Handling: Do not bend the optical cables beyond their specified minimum bending radius. Sharp bends can cause signal loss or permanent damage to the fiber.

• Dust Protection: Always keep the protective caps on the optical ports when the cables are not connected. Dust on the lenses can cause communication timeouts.

• Termination: Ensure the ModuleBus is correctly terminated at the last cluster. An unterminated bus will cause reflections and intermittent communication errors.

• MTU Compatibility: The TB840A must be mounted on a compatible Module Termination Unit (such as the TU840 or TU841). Ensure the MTU is correctly grounded to the DIN rail.

Typical Configuration

In a standard setup, the Fieldbus Communication Interface (FCI) sits in the “Head” station. The TB840A is then used to branch out the ModuleBus to secondary DIN rails (clusters) via fiber optic pairs (Transmit/Receive).

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