ABB TB840A ModuleBus Fiber Optic Communication Interface Module
ABB TB840A ModuleBus Fiber Optic Communication Interface Module
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Brand:ABB PLC Item No.:ABB TB840A Product Origin:Sweden Product Dimensions:54 × 119 × 96 mm Product Weight:0.20 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
The ABB TB840A is a high-reliability ModuleBus modem designed for the S800 I/O distributed system used in ABB control platforms such as System 800xA. The module acts as a communication interface between the electrical ModuleBus and the Optical ModuleBus, enabling stable high-speed data exchange between I/O clusters and controllers.
This communication module is widely used in redundant automation architectures, where two modems operate in parallel to ensure continuous operation even if one communication path fails. The TB840A provides fiber-optic connectivity that improves noise immunity and allows longer communication distances compared to traditional electrical connections.
Designed for industrial reliability, the TB840A supports hot-swap capability and integrates seamlessly into modular I/O systems, making it a dependable solution for complex process automation environments.
Technical Specifications
Parameter
Specification
Model
TB840A
Part Number
3BSE037760R1
Product Type
ModuleBus Fiber Optic Communication Module
System Compatibility
ABB S800 I/O / System 800xA
Communication Protocol
ABB ModuleBus
Interfaces
Electrical ModuleBus + Optical ModuleBus
Fiber Ports
2 Optical ModuleBus Ports
Redundancy
Line Redundancy and Module Redundancy Supported
Hot Swap
Supported
Power Supply
24 V DC
Typical Current Consumption
120 mA
Max Electrical ModuleBus Capacity
Up to 12 I/O Modules
Max Optical ModuleBus Clusters
Up to 7 Clusters
Transmission Speed
Up to 10 Mbps
Operating Temperature
Up to 55°C (horizontal mounting)
Mounting Method
DIN Rail Mounting
Dimensions
54 × 119 × 96 mm
Weight
0.20 kg
Recommended Related Models
For building a reliable ABB S800 I/O architecture, the following modules are commonly used together with TB840A:
ABB CI840A Fieldbus Communication Interface
ABB CI801 PROFIBUS Interface Module
ABB TB820V2 ModuleBus Modem
ABB TU840 Module Termination Unit
ABB TU841 Terminal Unit
These modules expand network connectivity and provide flexible distributed I/O configurations for large automation systems.
Popular ABB Models in Industrial Automation
Several ABB automation modules are widely deployed across industrial PLC and DCS systems:
ABB PM591-ETH PLC Controller
ABB CI840A Communication Interface
ABB AI830A Analog Input Module
ABB SB822 Power Supply Module
ABB PP865A Industrial HMI Panel
These products form the backbone of many industrial control architectures used worldwide.
Industrial Applications
The TB840A communication module is designed for demanding automation scenarios requiring reliable data transmission:
Distributed process control systems
Power generation and energy distribution
Oil and gas production facilities
Chemical and petrochemical plants
Water treatment and environmental control systems
Large manufacturing automation lines
Its fiber-optic communication capability ensures stable signal transmission in electrically noisy industrial environments.
Advantages
Reliable Redundant Communication
Supports 1+1 redundant network architecture to guarantee continuous system availability.
Fiber-Optic Noise Immunity
Optical communication eliminates electromagnetic interference common in industrial environments.
Flexible I/O Expansion
Supports up to 12 I/O modules and multiple clusters, enabling scalable automation architectures.
Hot-Swap Maintenance
Modules can be replaced without shutting down the system, reducing downtime during maintenance.
Seamless ABB System Integration
Fully compatible with ABB S800 I/O and System 800xA control platforms for smooth deployment.
Technical FAQs
1. What is the primary function of the TB840A module?
It provides a fiber-optic interface between electrical ModuleBus and Optical ModuleBus in ABB S800 I/O systems.
2. Which automation platforms use TB840A?
It is typically used in ABB System 800xA and S800 distributed I/O systems.
3. Does the TB840A support redundant communication?
Yes. It supports line redundancy and module redundancy for high system availability.
4. How many fiber optic interfaces does the module provide?
The module includes two optical ports for Optical ModuleBus communication.
5. How many I/O modules can be connected through the ModuleBus?
Up to 12 I/O modules can be connected to the electrical ModuleBus.
6. Can the TB840A be replaced without shutting down the system?
Yes, it supports hot-swap replacement, allowing maintenance without stopping operations.
7. What is the power supply requirement?
The module operates using 24 V DC power input.
8. What mounting method is used for installation?
It is designed for standard DIN rail installation inside industrial control cabinets.
9. What are the physical dimensions of the TB840A?
The module measures 54 × 119 × 96 mm.
10. What industries typically use this communication module?
Industries such as power, oil & gas, manufacturing, chemical processing, and water treatment commonly deploy TB840A in distributed automation systems.
