ABB TB840A 3BSE037760R1 – Optical ModuleBus Communication Interface (S800 I/O, Fiber Link Adapter)
1. General Description
The ABB TB840A (3BSE037760R1) is an upgraded optical link module used to extend the ModuleBus communication between S800 I/O clusters and system controllers over single-mode fiber optic cable. It is commonly used in large-scale distributed control systems where long-distance communication, electrical isolation, and high resistance to electromagnetic interference are needed.
This model is part of the S800 I/O communication family, succeeding earlier TB840 versions with improved diagnostics and firmware reliability.
2. Main Technical Data (Non-table format for this model)
Module type: Optical ModuleBus extender / repeater
Fiber standard: Single-mode, 1310 nm wavelength
Max fiber distance: Up to 15 km per link
Fiber connector: SC-type duplex optical interface
Bus side interface: Standard electrical ModuleBus connector (rear)
Power supply: Derived from S800 I/O base – no external wiring
Power consumption: < 1.5 W
Operating temperature: –25 °C … +70 °C
Protection rating: IP20, cabinet-installed
Module width: Standard S800 form factor (plug-in)
Certifications: CE, UL, CSA, Marine, ATEX (in certified assemblies)
3. Key Features & Functions
| Feature |
Description |
| Long-distance fiber link |
Enables remote racks up to 15,000 m away |
| Full galvanic isolation |
Protects ModuleBus from ground shifts, surges, EMI |
| Plug-and-play integration |
Auto-recognition in AC 800M and Advant systems |
| Front LED indicators |
Fiber link active, ModuleBus OK, status/fault |
| Hot-swappable design |
Allows replacement without system shutdown |
| Noise immunity |
Ideal for power plants, substations, and heavy industry |
| A-revision hardware |
Improved PCB layout, enhanced diagnostics, revised firmware |
4. Module Composition
Optical Transceiver Section – Converts electrical ModuleBus signals to fiber
Microcontroller & Diagnostics – Supervises link health, firmware handshake
Backplane Connector – Connects to S800 base (TU830, TU833, TU842, etc.)
Front Plate Indicators – Power, Link OK, Module Status LEDs
Shielded Housing – Prevents electrostatic and EMC interference
5. Compatible System Hardware
AC 800M Controllers: PM851, PM856, PM891, etc.
Communication Interfaces: CI801, CI840A, CI854A
Terminal Bases: TU830/TU833, TU842/TU843, TU852, etc.
Used in systems: ABB 800xA, Symphony Plus, Advant Master, Freelance
6. Typical Use Cases
Fiber-linked remote I/O buildings in power stations
Long-range S800 I/O expansion for oil & gas platforms
EMI-heavy areas such as HV switchgear rooms and steel plants
Distributed turbine, compressor, or pipeline control skids
Redundant controller layouts requiring isolated ModuleBus paths
7. Installation & Commissioning Tips
Mount directly onto the selected TU base before connecting fiber
Clean SC connectors prior to insertion; avoid bending fiber below radius spec
Verify link LEDs on both ends before enabling I/O in Control Builder
Fiber must be single-mode, not multimode (SMF-28 grade recommended)
For redundant paths: install paired TB840A modules per channel
No address setting required — module is auto-detected via ModuleBus
8. Maintenance & Lifecycle
No periodic calibration or mechanical service required
Optional event logging available through 800xA diagnostics
Recommended spare stock: 1 module per fiber-linked segment
Board failure automatically triggers diagnostic alarm on controller
Replacement time < 2 minutes due to hot-swap cartridge design
9. Additional Notes
Ordering code 3BSE037760R1 identifies hardware revision A (latest supported)
Fully backward compatible with TB840 and TB840V1 in mixed networks
Approved for ABB long-term lifecycle programs (installed base > 10 years)
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