Application Scenarios

In a Taiyuan steel mill’s​ rolling mill control cabinet, multiple S800 I/O racks are spread across several DIN rails. The TB806​ is mounted at the end of each rack, connected via a flat cable (TK801) to the next rack’s TB805 (Bus Inlet Module). This daisy-chain topology ensures that all digital and analog modules, regardless of their physical location, are synchronized on the same high-speed ModuleBus network for real-time data exchange with the AC 800M controller.

 

Parameter

Main Parameters	Value/Description
Product Model​	TB806​
ABB Order Code​	3BSE008536R1​
Product Type​	ModuleBus Cable Adapter / Bus Inlet
Connector Type​	D-sub 25-pin, Male​ (for ModuleBus flat cable)
Compatible Systems​	ABB Advant OCS, 800xA, S800 I/O
Key Partners​	TB805 (Bus Inlet Module), TK801 (Extension Cable)
Operating Temp.​	0 °C to +55 °C​ (Storage: -25 °C to +70 °C)
Protection Class​	IP20 (For cabinet interior use only)
Mounting​	DIN Rail (35mm)
Dimensions (WxHxD)​	22 mm x 109 mm x 25 mm
Weight​	~46 g

 

 

Technical Principles and Innovative Values

• Innovation Point 1: Enabling Distributed I/O Architecture:​ The primary innovation of the TB806​ is its role in decoupling the ModuleBus​ from a single contiguous backplane. By providing a robust D-sub 25-pin outlet, it allows the S800 system to be physically distributed across multiple DIN rails or even separate cabinets while maintaining a single logical bus. This is critical in complex Taiyuan industrial plants where space constraints require control equipment to be split between multiple enclosures without sacrificing communication integrity.
• Innovation Point 2: Robust Industrial Connector Design:​ Unlike consumer-grade DB25 connectors, the TB806​ uses an industrial-grade, screw-locked D-sub connector specifically designed for the TK801 flat cable. This design ensures high vibration resistance—a common issue in heavy industries like mining and steel—preventing accidental disconnection that could bring down an entire I/O segment. The connector also integrates shielding contact points to maintain EMC performance in noisy environments.
• Innovation Point 3: Optical Bus Extension Gateway:​ The TB806​ serves as the electrical-to-optical conversion interface when used with the TB842 Optical Modem. This allows the ModuleBus to be extended over fiber optic cables​ for long-distance runs (hundreds of meters) between plant areas, providing galvanic isolation and immunity to lightning strikes and ground potential differences, which is a significant advantage in large-scale process plants.

 

Application Cases and Industry Value

Case 1: Chemical Plant Expansion, Shanxi Province.​ A chemical plant needed to add a new reactor skid to its existing ABB 800xA system. The new skid’s S800 I/O rack was installed in a remote cabinet. Using the TB806​ connected to the existing rack via a TK801 cable, the plant engineers seamlessly extended the ModuleBus to the new rack without requiring additional communication processors or complex network configuration, saving on hardware and commissioning time.Case 2: Power Plant SOE (Sequence of Events) System.​ In a critical SOE application where timestamp accuracy is paramount, the TB806​ ensures that all distributed I/O modules receive synchronized clock signals over the ModuleBus. Its reliable connection maintains the deterministic timing of the bus, allowing events from breakers and relays across the plant to be recorded with millisecond precision on a unified timeline.