ABB TB840 3BSE021456R1 Modulebus Cluster Modem

The ABB TB840 3BSE021456R1 is an optical ModuleBus modem specifically designed for redundant configurations within the ABB S800 I/O system. It allows seamless optical communication between I/O clusters via ModuleBus in distributed and modular installations. The TB840 operates as an interface unit for the electrical and optical ModuleBus, enhancing reliability and flexibility in field I/O systems, especially where long-distance or high-integrity communication is required.

Technical Specifications

Applications

• Distributed control systems using ABB’s 800xA or Advant Master

• Redundant field I/O setups requiring high communication reliability

• Industrial automation systems with remote or harsh environment installations

• Long-distance I/O expansion using optical media converters and modems

• Communication bridging in energy, chemical, oil & gas, and manufacturing sectors

Advantages

• High Reliability: Ensures robust communication via optical redundancy

• Compact Form Factor: Small footprint ideal for space-constrained panels

• Flexible Integration: Compatible with S800 I/O clusters and fieldbus interfaces

• Electrically Isolated: Enhances safety and reduces interference

• DIN Rail Mounting: Quick and easy installation

• Redundant Configuration Support: Increases system uptime and fault tolerance

Frequently Asked Questions (FAQ)

Q1: What is the function of the TB840?

A1: It acts as a redundant optical modem enabling communication between S800 I/O clusters via the ModuleBus.

Q2: Is the TB840 suitable for non-redundant systems?

A2: It is primarily designed for redundant applications, but can operate in certain non-redundant setups if properly configured.

Q3: What power supply is needed for TB840?

A3: It requires a 24 V DC power supply, with an acceptable range of 19.2 to 30 V DC.

Q4: Can TB840 be hot-swapped?

A4: Yes, it supports hot swapping when used with compatible S800 I/O modules and termination units.

Q5: What type of fiber cables are compatible?

A5: Supports plastic fiber (up to 15 m), HCS glass fiber (up to 200 m), and with converters, ST glass fiber (up to 1000 m).

Q6: Is TB840 compatible with PROFIBUS or AF100?

A6: It connects ModuleBus segments and works with FCIs that support PROFIBUS or AF100.

Q7: What are the environmental compliance ratings?

A7: It is G3-compliant, suitable for harsh industrial environments (ISA-S71.04 level).

Q8: How is the TB840 installed?

A8: It is DIN rail mountable, making installation quick and standardized.

Q9: Does it support redundant I/O modules?

A9: Yes, it supports redundant I/O setups in combination with appropriate MTUs and CI interfaces.

Q10: Can TB840 be used in safety-critical environments?

A10: Yes, particularly when combined with certified SIL3-rated S800 modules.