TB845 ABB System 800xA Redundant ModuleBus Cable Adapter

ABB TB845 Dual Channel ModuleBus Adapter

The ABB TB845 (Part Number: 3BSE021437R1) is a redundant ModuleBus cable adapter designed for the ABB System 800xA and S800 I/O platforms. It extends the ModuleBus across multiple DIN rails to support distributed controller architectures. This adapter provides dual-channel communication redundancy to maintain uninterrupted data exchange between controllers and remote I/O modules during single-path failures.

System Integration and Compatibility

The TB845 operates within the ABB AC 800M and System 800xA control environments. It works in conjunction with compatible cable assemblies and termination components to link central processing units with distributed S800 I/O stations. The dual-channel architecture permits continuous signal transmission, isolating faults on one communication path while keeping the secondary link active to sustain system availability.

Physical and Environmental Specifications

The module features a standard industrial form factor designed for direct DIN rail mounting within control cabinets. It operates on a standard 24 VDC power supply typical of industrial automation architectures. The unit is rated with an IP20 protection class and operates reliably within a standard commercial temperature range suitable for indoor control room environments.

Frequently Asked Questions

Q: What is the primary function of the ABB TB845? A: It serves as a redundant ModuleBus cable adapter to extend communication between ABB controllers and S800 I/O modules across multiple DIN rails.

Q: Does the TB845 support communication redundancy? A: Yes, it features dual-channel redundant communication to maintain data exchange during single-path failures.

Q: What control systems are compatible with this module? A: It is designed specifically for ABB AC 800M and System 800xA environments using S800 I/O.