Yokogawa ANB11D-B15/BU2A ESB Bus Node Unit

Configured for high-speed optical field bus extension in CENTUM VP platforms, the Yokogawa ANB11D-B15/BU2A (ANB11D-B15 ESB Bus Node Unit) provides direct physical/electrical execution of long-distance communication and field device integration.

Suffix Breakdown & Model Matrix

Hardware Specifications

Process Control and DCS Characteristics

• 4-20 mA HART loop protocol: The unit facilitates transparent HART data transmission from connected I/O channels to the host DCS, maintaining signal integrity for device-level diagnostics.
• FOUNDATION Fieldbus / Profibus PA connectivity: The node interface supports deterministic fieldbus traffic, ensuring consistent update rates for process variables across the optical ESB bus architecture.
• Channel-to-channel isolation: The internal backplane design provides galvanic isolation to mitigate common-mode noise and prevent ground potential differences from affecting the high-speed optical bus communication.
• Cold junction compensation (CJC): The unit interfaces with I/O modules to support thermocouple CJC, ensuring temperature measurement accuracy by referencing local ambient thermal sensors.

Frequently Asked Questions

Q: Does the ANB11D support both star and chain network topologies?

A: Yes. The optical ESB bus architecture supports both chain and star configurations to facilitate flexible network deployment over distances up to 5 km.

Q: Can the dual-redundant power supply modules be serviced during operation?

A: Yes. The power supply section is designed for hot-swapping, allowing for module replacement without disrupting the node's optical communication link or I/O data processing.

Field Installation Guidelines

• Mounting: Secure the node unit into a standard 19-inch equipment rack using the four M5 mounting screws. Ensure sufficient clearance is maintained for cable routing and heat dissipation from the 120 W internal power components.
• Grounding: Bond the node chassis to the cabinet protective earth (PE) bus using a dedicated, low-impedance copper cable. A solid ground reference is mandatory to ensure EMC compliance and to protect optical conversion circuitry from transient surges.
• Wiring: Route optical fiber cables with care, ensuring the minimum bend radius is maintained to prevent signal attenuation. Keep optical data lines segregated from high-voltage AC/DC power cabling to eliminate potential electromagnetic interference.