Product Details
Description
The TB840 Cluster Modem extends the Modulebus for distributed S800 I/O clusters using fiber optic connections. It provides signal isolation, eliminates ground loops, and resists EMI. Used in redundant pairs, it ensures reliable communication between the FCI and remote I/O in large industrial DCS systems.
Specifications
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Manufacturer: ABB
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Country of Origin: Sweden
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Model Number: TB840
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Order Number: 3BSE021456R1
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Product Series: S800 I/O
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Function: Modulebus Cluster Extension
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Communication Speed: 10 Mbit/s
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Redundancy: Supports dual-cluster modem configurations
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Power Supply: 24 V DC (via MTU)
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Approximate Weight: 0.15 kg
Features
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Optical Isolation: Converts electrical signals to fiber optics to provide total galvanic separation and noise immunity between clusters.
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Redundant Path Support: Facilitates the implementation of redundant Modulebus architectures for high-availability control systems.
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Signal Regeneration: Active electronics ensure that communication pulses are refreshed, allowing for reliable data transfer over extended distances.
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Compact Integration: Designed for efficient DIN-rail mounting on specialized Module Termination Units (MTUs).
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Diagnostic Monitoring: Features front-panel LED indicators to provide real-time status of power, traffic, and internal hardware health.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Redundant Automation Systems: Core Architecture, Business Value, and Technical Advantages
Unplanned downtime poses a major financial threat to process manufacturing. To prevent costly interruptions, engineers deploy redundant PLC and DCS architectures that ensure continuous operation when hardware fails. This technical guide explores redundancy principles, critical system nodes, and real-world scenarios.
Preventing Emergency Stop Spurious Trips in Industrial Control Systems
Emergency Stop pushbuttons use Normally Closed contacts for fail-safe safety, but mechanical wear can cause costly spurious trips. This technical guide examines E-Stop contact failure root causes, redundant hardware setups, PLC logic monitoring, and maintenance strategies to maximize plant availability.
Why 24V DC Is the Universal Standard for Industrial Automation Power Supplies
Industrial manufacturing requires continuous uptime to prevent equipment damage. Unlike AC power, 24V DC circuits seamlessly integrate with UPS units and battery banks. During main grid failures, a 24V DC backup system instantly maintains PLC memory, instrument loops, and critical safety valves without interruption.