Yokogawa ANB11D-615/BU2A Optical Bus Nodes

Configured for long-distance I/O expansion in CENTUM VP distributed control systems, the Yokogawa ANB11D-615/BU2A (ANB11D-615/BU2A Optical ESB Bus Node) provides direct physical/electrical execution of ESB bus to fiber optic signal conversion.

Hardware Specifications

Process Control and DCS Connectivity

• Channel-to-Channel Isolation: The node maintains electrical isolation between the primary ESB bus and the fiber optic communication layer, preventing ground potential differences from affecting data integrity over long-distance links.
• FOUNDATION Fieldbus / Profibus PA Connectivity: While primarily serving as an ESB bus node, the unit provides the necessary bandwidth and deterministic transport layer to support downstream Fieldbus and Profibus PA traffic integrated through the CENTUM VP I/O subsystems.
• Cold Junction Compensation (CJC): The unit is designed to house I/O modules that support CJC. The ruggedized chassis maintains thermal stability, ensuring that local thermocouple reference junctions remain within specified accuracy limits despite the corrosive and temperature-variable environments in which the node is deployed.

Frequently Asked Questions (FAQ)

Q: Does the dual-redundant power supply configuration support hot-swapping of power units?

A: Yes. The ANB11D-615/BU2A is designed for active-active redundancy, allowing individual power supply units to be replaced while the node remains operational, provided the cabinet power bus is maintained.

Q: Can this node be utilized for both star and chain fiber topologies?

A: Yes. The integrated BU2A connector and internal logic support both fiber optic topologies, providing flexibility for resilient network architecture design.

Field Installation Guidelines

• Environmental Protection: The module features ISA G3 conformal coating. Ensure that the module remains sealed within its designated 8U rack space to maintain protection against H2S and SO2 corrosive gases.
• Fiber Optic Integrity: Handle fiber optic connectors with extreme care. Maintain a bend radius consistent with the cable manufacturer's specifications to prevent signal attenuation over the 5 km transmission range.
• Power Redundancy: Connect the dual 100–120 V AC inputs to independent power sources to ensure continuous operation in the event of a single-phase supply failure.
• Mounting: The unit requires a standard 19-inch rack. Ensure sufficient clearance for airflow, as the unit consumes up to 120 W under maximum I/O load.
• Validation: Verify link status through the CENTUM VP engineering station. Perform an optical power level check on the fiber links to ensure signal margins exceed the minimum receiver sensitivity.