Product Overview
The TB840 (Part Number: 3BSE021456R1) is a high-performance Modulebus Cluster Modem designed for the ABB S800 I/O system and Symphony Plus control architectures. Its primary technical function is to provide an optical communication link between distributed I/O clusters and the central controller. By utilizing optical fiber, the TB840 (3BSE021456R1) ensures interference-free data transmission over extended distances, effectively isolating the control network from electromagnetic interference (EMI) and ground loops. This module is specifically engineered to support 1+1 redundancy, allowing for high-availability configurations where seamless failover is required to maintain continuous process control in critical industrial applications.
Detailed Technical Specifications
| Feature | Specification |
| Manufacturer | ABB |
| Model Number | TB840 |
| Product ID | 3BSE021456R1 |
| Type | Modulebus Cluster Modem |
| Communication Speed | Up to 10 Mbit/s |
| Redundancy Support | 1+1 Redundant Operation (Master/Slave) |
| Communication Medium | Optical Fiber Link |
| System Compatibility | S800 I/O, Symphony Plus, AC 800M Controllers |
| Power Supply | 24 VDC (Typical) |
| Power Dissipation | 2.5 W (Typical) |
| Module Dimensions | 160 mm x 157 mm x 80 mm |
| Weight | 0.4 kg (0.88 lbs) |
| Origin | Finland / Sweden |
| Tariff Code | 8517620050 |
What's clients say about us
Excellent Emergency Support!
Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.
Mark Thompson
Maintenance Manager, USAReliable Source for New Spares
Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.
Robert Hoffmann
Engineering Lead, GermanyTop-tier Service and Quality
We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.
Lucas Müller
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Guide
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