ABB TB840A Optical ModuleBus Communication Interface Module
Order Number: 3BSE037760R1
Belonging System: ABB AC800M / 800xA DCS, S800 Distributed I/O System
I. Product Introduction
TB840A is a ModuleBus optical cluster modem module, which realizes the optical-electrical signal conversion between the local electrical ModuleBus of S800 I/O and the optical ModuleBus for remote I/O stations, enabling long-distance and anti-interference networking. It supports 1+1 dual-link redundancy and can significantly extend the communication distance between the controller and the on-site I/O cabinets, avoiding ground loops and strong electromagnetic interference issues.
Core Functions
Optical-Electrical Signal Conversion
Converts the electrical ModuleBus in the cabinet to an optical bus, enabling high-speed data interaction between the remote S800 I/O cluster. Each I/O cluster can be connected with up to 12 S800 I/O modules, and each controller can be expanded with up to 7 groups of optical I/O clusters.
Dual-Fiber Redundant Communication
The module is equipped with 2 fiber SFP slots, and paired configuration can build A/B dual-fiber redundant links. In case of link failure, it automatically switches within milliseconds, meeting SIL3 safety systems, ESD interlocks, and other high-reliability scenarios.
I/O Cluster Isolated Power Supply
Provides isolated 5V working power for all S800 I/O modules in this cluster. It has built-in hardware protection for short circuits and overcurrents. A single cluster power failure does not affect the operation of other I/O stations.
Real-time Bus Fault Diagnosis
Panel LED indicators monitor the power, ModuleBus bus status, and fiber transmission link faults in real time. Fault information is uploaded to the 800xA upper system for rapid location of fiber breakage, module failure, and bus abnormalities.
Hardware Interface Configuration
Electrical ModuleBus Interface: Connects to the TU840/TU841 terminal base, and links the S800 I/O card in this rack
Dual SFP Optical Slots: Plug-and-play SFP optical modules, supporting multimode / single-mode fibers
Multimode Fiber: Maximum transmission distance 2km
Single-mode Fiber: Maximum transmission distance 20km
Status Indicators: Power, Operation, Bus Fault, Fiber Link Alarm Indicators
Cluster Address DIP Switch: Sets the 1-7 I/O cluster address through the base rotating switch
Electrical and Environmental Parameters
Order Code: TB840A, 3BSE037760R1
Power Supply: DC 24V (19.2～30VDC), Power Consumption approximately 2W
Bus Rate: 10Mbps ModuleBus dedicated high-speed bus
Installation: DIN35 standard rail installation
Protection Grade: IP20 (only installed in the control cabinet)
Operating Temperature: 0℃～+55℃; Storage Temperature: -40℃～+85℃
Humidity: 5%～95% RH, no condensation, compliant with industrial EMC electromagnetic compatibility standards
Net Weight: 272g
Selection of Terminal Base
Table
Base Model Applicable Scenarios Configuration Description
TU840 Redundant TB840A + Redundant S800 I/O Dual ModuleBus buses, dual-module redundant installation
TU841 Redundant TB840A + Non-redundant S800 I/O Single electrical ModuleBus, suitable for ordinary control stations
TU807 Non-redundant Use of Single TB840A Single module, single rack, conventional networking
Typical Application Scenarios Remote S800 I/O fiber redundant networking between power plants, chemical plants, and oil refineries
Long-distance IO signal acquisition in substations and coal chemical plants under strong electromagnetic environment
Establishment of highly reliable communication links for ABB SIS safety instruments and ESD emergency stop systems
Centralized connection of multiple cabinets’ distributed field measurement points to AC800M controller
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