Yokogawa ANB11D-215/BU2B Optical ESB Bus Node

Configured for long-distance ESB bus expansion in CENTUM VP distributed control systems, the Yokogawa ANB11D-215/BU2B (ANB11D-215/BU2B Node Unit) provides direct physical/electrical execution of optical signal repeating and I/O bus termination.

Hardware Specifications

Process Control and DCS Connectivity

• Channel-to-Channel Isolation: The node provides galvanic isolation between the ESB bus backplane and the external optical link, ensuring that field-side ground shifts do not compromise the Field Control Unit (FCU) logic integrity.
• FOUNDATION Fieldbus / Profibus PA Connectivity: The architecture supports high-speed deterministic data throughput, facilitating the integration of Fieldbus and Profibus PA segments through the CENTUM VP I/O subsystem without inducing communication jitter.
• Cold Junction Compensation (CJC): The chassis design ensures thermal stability for installed I/O modules. By maintaining a regulated internal environment, the node prevents localized temperature gradients that could adversely affect the precision of CJC-dependent thermocouple measurements in remote instrumentation clusters.

Frequently Asked Questions (FAQ)

Q: Does the BU2B connector assembly require external termination for the ESB bus?

A: No. The BU2B connector features an integrated ESB bus terminator, specifically designed for end-of-line optical node applications to maintain bus impedance matching.

Q: Is the dual-redundant power supply capable of 220–240 VAC input?

A: Yes. The power modules are configured for standard 220–240 VAC (50/60 Hz) operation, providing active-active redundancy to ensure uptime in mission-critical process loops.

Field Installation Guidelines

• Mechanical Mounting: Install the unit in a standard 19-inch industrial rack. Ensure sufficient vertical clearance for the 10 kg assembly and confirm that the chassis is securely bonded to the rack ground bus to mitigate EMI/RFI.
• Fiber Optic Cabling: Route optical fiber cables through dedicated protective conduits. Observe the manufacturer-specified minimum bend radius to prevent signal loss over the 5 km maximum transmission distance.
• Power Connectivity: Connect the dual power modules to separate power circuits where possible. This prevents a single branch circuit fault from resulting in a complete node shutdown.
• Bus Termination: Verify the bus topology prior to installation. Since the BU2B includes an integrated terminator, ensure this node is placed at the physical end of the ESB bus segment to prevent signal reflections.
• Validation: Check the status indicators on the node front panel after energizing the power supplies. Monitor the optical link signal quality via the CENTUM VP engineering terminal to confirm synchronization with the central controller.