Yokogawa ANB11D-425/BU2A CENTUM VP Node Units

The Yokogawa ANB11D-425/BU2A, also cataloged as the ANB11D-425/BU2A Node Unit, operates as a dedicated hardware component for dual-redundant ESB bus optical communication and field I/O signal transmission within CENTUM VP platforms.

Suffix Breakdown & Model Matrix

Hardware Specifications

Process Control and DCS Characteristics

• 4-20 mA HART loop protocol: The unit supports integrated HART pass-through, allowing the DCS asset management system to query device diagnostics and configuration parameters directly through the control loop.
• FOUNDATION Fieldbus / Profibus PA connectivity: The architecture facilitates deterministic communication with fieldbus-based instrumentation, ensuring precise timing and data synchronization across the control network.
• Channel-to-channel isolation: The module design maintains galvanic separation between internal processing logic and field I/O connections to mitigate common-mode noise and protect against signal transients.
• Cold junction compensation (CJC): The unit interfaces with I/O terminal boards to execute high-precision CJC for thermocouple inputs, maintaining measurement accuracy across the wide operating temperature range.

Frequently Asked Questions

Q: Does the dual-redundant power supply configuration support online module replacement?

A: Yes. The dual-redundant power architecture allows individual power modules to be replaced online without interrupting node operation or field I/O power.

Q: What is the maximum transmission distance supported by the built-in optical repeater?

A: The optical repeater configuration supports long-distance signal transmission of up to 50 km using compatible optical network components.

Field Installation Guidelines

• Mount the 19-inch rack unit securely inside a grounded industrial cabinet, ensuring adequate vertical clearance above and below the chassis for thermal dissipation within the -20 deg C to 50 deg C operating range.
• Connect incoming power lines to the designated input terminals, verifying correct voltage range matching and reliable earth grounding to eliminate ground loops.
• Route optical fiber cables carefully, observing minimum bend radius limits and protecting connector endpoints from dust and mechanical stress to maintain signal integrity over long distances.
• Ensure that field signal shield drains are tightly secured to the designated cabinet grounding bar to preserve channel isolation and protect against common-mode noise transients.