What Is the ABB TB805 ModuleBus Cable Adaptor?
When expanding an ABB S800 I/O system, the TB805 3BSE008534R1 ModuleBus Cable Adaptor solves a common layout challenge. This compact adapter, used together with the TB806 and TK801V0xx, extends the electrical ModuleBus so that I/O modules can be mounted on different DIN rails while maintaining a single electrical bus. Part of the proven S800 mechanics family, the TB805 is designed for industrial environments where space constraints or cabinet layouts require distributed module placement.
Technical Specifications Breakdown
The TB805 delivers robust performance backed by clear environmental and safety ratings. It operates reliably from 0 to +55 °C with storage capability from -25 to +70 °C, and handles relative humidity from 5 to 95 % non-condensing per IEC/EN 61131-2. The adapter carries CE marking and meets electrical safety standards IEC 61131-2, UL 61010-1, and UL 61010-2-201. For hazardous locations, it is certified C1 Div 2 cULus, C1 Zone 2 cULus, and ATEX Zone 2. Marine certifications include ABS, BV, DNV, and LR. The TB805 achieves IP20 protection according to IEC 60529, with pollution degree 2 per IEC 60664-1 and corrosion protection ISA-S71.04 G3. Its compact dimensions—22 mm wide, 25 mm deep, 109 mm high—and light weight of 46 g make it easy to integrate into crowded panels.
Industry Applications
In process industries such as chemical plants and refineries, the TB805 enables distributed I/O placement across multiple DIN rails, simplifying cable routing and reducing panel clutter. For marine and offshore applications, its ABS, BV, DNV, and LR certifications ensure compliance with stringent maritime standards. The adapter's ATEX Zone 2 and cULus hazardous location approvals make it suitable for oil and gas environments where explosive atmospheres may occur.
Installation & Setup Guidance
Mount the TB805 on a standard DIN rail within the S800 I/O system. Connect it to the TB806 and TK801V0xx to extend the ModuleBus. Ensure the operating temperature stays between 0 and +55 °C and that the environment remains non-condensing with 5 to 95 % RH. The IP20 rating means the adapter should be installed inside a suitable enclosure to protect against dust and accidental contact. Always follow the manufacturer's guidelines for proper grounding and bus termination.
Maintenance & Reliability
The TB805 requires minimal routine maintenance. Periodically inspect the adapter for signs of corrosion or physical damage, especially in G3 corrosive environments per ISA-S71.04. Check that all connections remain secure and that the DIN rail mounting is stable. Regular inspection helps maintain reliable ModuleBus communication and extends service life, reducing total cost of ownership.
Compatibility & Integration
The TB805 is designed specifically for ABB S800 I/O systems. It works seamlessly with the TB806 and TK801V0xx to extend the ModuleBus. The adapter supports any S800 I/O module that communicates over the electrical ModuleBus, enabling flexible placement on separate DIN rails while preserving bus integrity.
Selection Guide & Purchasing Advice
Before ordering, verify that your system uses S800 I/O modules and that you have the required TB806 and TK801V0xx components. Confirm that your application's environmental conditions fall within the TB805's operating range of 0 to +55 °C and that hazardous location certifications match your area classification. SpareTechPLC stocks the ABB TB805 3BSE008534R1 ModuleBus Cable Adaptor and can help with availability and lifecycle status.
Frequently Asked Questions
Can the TB805 be used with S900 I/O systems?
No, the TB805 is designed exclusively for the ABB S800 I/O system. It is not compatible with S900 or other series.
What is the maximum cable length for ModuleBus extension with the TB805?
The provided data does not specify a maximum cable length. Refer to the ABB S800 I/O system manual for bus length guidelines.
Does the TB805 require external power?
No, the TB805 is a passive cable adaptor that does not require external power. It simply extends the electrical ModuleBus.
Is the TB805 suitable for outdoor installation?
The TB805 has an IP20 rating and is intended for indoor use inside a suitable enclosure. It is not rated for outdoor exposure without additional protection.
What certifications does the TB805 hold for hazardous locations?
The TB805 is certified C1 Div 2 cULus, C1 Zone 2 cULus, and ATEX Zone 2, making it suitable for use in classified hazardous areas.
