Product Description

The ANB11D-226/BU2B is a high-availability interface node designed for the Yokogawa CENTUM VP distributed control system (DCS). It functions as a communication bridge that extends the ESB bus over long distances through an integrated optical repeater. With support for fiber optic transmission up to 5 km, it enables remote I/O clusters to remain fully synchronized with the central Field Control Unit (FCU) without signal degradation or electromagnetic interference.

To maximize system uptime, the ANB11D-226/BU2B features a dual-redundant power supply architecture, protecting against single-point failures. The BU2B connector assembly includes a built-in terminator, making this unit suitable for end-of-line deployment in optical ESB bus segments. Designed for 220–240 V AC industrial environments, it delivers stable and reliable performance in demanding automation systems.

Technical Specifications

Application Context

The ANB11D-226/BU2B is widely used in large and geographically distributed facilities such as:

• Chemical processing plants

• Offshore oil and gas platforms

• Municipal water treatment systems

Its optical repeater enables EMI-immune communication, allowing instrumentation located several kilometers away from the control room to maintain real-time communication with the CENTUM VP system while ensuring signal integrity and system reliability.

FAQ

What is the specific benefit of the BU2B connector?
The BU2B connector includes an internal terminator, which is essential for the final node in an ESB bus chain. It prevents signal reflections and simplifies system design by eliminating the need for an external termination unit.

Can this unit be used with 110 V AC power?
No, the “-2” suffix indicates that the ANB11D-226/BU2B is designed for 220–240 V AC. For 100–120 V AC systems, a model with the “-1” suffix must be selected to ensure proper operation and avoid equipment damage.