Product Overview
When expanding an ABB S800 I/O system, maintaining reliable communication across multiple DIN rails is critical. The ABB TB846 3BSE021439R1 Dual Modulebus Inlet Module provides a robust solution for extending the ModuleBus in redundant configurations. Designed to work with the TB845 and two TK801V0xx cables, this module allows I/O modules on the same electrical ModuleBus to be mounted on different DIN rails. It also supports optical extension when paired with the TB842, offering flexibility for distributed control architectures.
Technical Specifications Breakdown
The TB846 operates within a temperature range of 0 to +55 °C (storage -25 to +70 °C) with 5 to 95% relative humidity (non-condensing), complying with IEC/EN 61131-2. Its protection class is IP20 per IEC 60529, making it suitable for clean indoor environments. The module measures 43 mm wide, 31.5 mm deep, and 186 mm high, weighing 180 g. It carries CE marking and meets electrical safety standards IEC 61131-2, UL 61010-1, and UL 61010-2-201. For hazardous locations, it holds C1 Div 2 cULus, C1 Zone 2 cULus, and ATEX Zone 2 certifications. Marine certifications include ABS, BV, DNV, and LR. The TB846 also complies with EMC standards EN 61000-6-4 and EN 61000-6-2, and is rated for pollution degree 2 per IEC 60664-1.
Industry Applications
In process industries such as oil and gas, chemical, and marine, the TB846 enables distributed I/O placement without sacrificing signal integrity. For example, in a refinery, you can mount I/O modules on separate DIN rails within the same cabinet or across adjacent cabinets, reducing wiring complexity. The redundant ModuleBus design ensures continuous operation even if one path fails, which is critical for safety-instrumented systems. Marine applications benefit from the module's ABS, BV, DNV, and LR certifications, allowing deployment on ships and offshore platforms.
Installation & Setup Guidance
Mount the TB846 on a standard DIN rail within an IP20-rated enclosure. Connect the TB845 and two TK801V0xx cables to establish the electrical ModuleBus extension. For optical extension, pair the TB846 with a TB842. Ensure all connections are secure and follow the manufacturer's guidelines for cable routing to minimize electromagnetic interference. Verify that the ambient temperature stays within 0 to +55 °C and that relative humidity remains between 5 and 95% non-condensing. The module is Class I equipment and must be earth-protected per IEC 61140.
Maintenance & Reliability
The TB846 is designed for long-term reliability in harsh industrial environments. Its corrosion protection meets ISA-S71.04 G3, making it resistant to corrosive gases. Regular inspection of connectors and cables is recommended to maintain signal integrity. Since the module has no moving parts, its primary wear points are the cable connections. Periodic checks of the DIN rail mounting and environmental conditions help ensure consistent performance. The module's compliance with IEC 61131-2 for mechanical operating conditions guarantees robustness under vibration and shock.
Compatibility & Integration
The TB846 is part of the ABB S800 I/O family and integrates seamlessly with ABB control systems such as AC 800M and other compatible controllers. It supports both electrical and optical ModuleBus extensions, providing flexibility for various network topologies. The module is designed for redundant configurations, enhancing system availability. For integration, use the TB845 for electrical extension or the TB842 for optical extension. The TB846 is CE marked and complies with EMC standards, ensuring reliable operation in electrically noisy environments.
Selection Guide & Purchasing Advice
Before purchasing the TB846, verify that your system requires redundant ModuleBus extension and that you have the necessary companion modules (TB845 and TK801V0xx cables for electrical extension, or TB842 for optical). Confirm that the operating environment meets the temperature, humidity, and pollution degree specifications. For hazardous location installations, ensure compliance with the relevant certifications (C1 Div 2, C1 Zone 2, or ATEX Zone 2). SpareTechPLC offers the ABB TB846 3BSE021439R1 with full warranty and fast shipping. Contact our team to confirm current lifecycle status and availability before ordering.
Frequently Asked Questions
Q: Can the TB846 be used without the TB845?
A: No, the TB846 is designed to work together with the TB845 and two TK801V0xx cables for electrical ModuleBus extension. For optical extension, pair it with the TB842.
Q: What is the maximum cable length for the ModuleBus extension using the TB846?
A: The provided data does not specify maximum cable length. Please refer to the ABB S800 I/O system manual or contact SpareTechPLC for detailed cabling guidelines.
Q: Is the TB846 suitable for outdoor installation?
A: No, the TB846 has an IP20 protection rating and is intended for indoor use within a clean, dry enclosure. It must be protected from moisture and dust.
Q: Does the TB846 support redundant power supply?
A: The TB846 is a ModuleBus inlet module and does not include power supply functionality. Redundant power should be provided by an appropriate S800 power supply module.
Q: What certifications does the TB846 hold for hazardous locations?
A: The TB846 is certified for C1 Div 2 cULus, C1 Zone 2 cULus, and ATEX Zone 2 hazardous locations.
