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Description
Yokogawa ANB11D-B25/BU2A ESB Bus Node Unit
The Yokogawa ANB11D-B25/BU2A, also cataloged as the ANB11D Node Unit, operates as a dedicated hardware component for deterministic ESB bus I/O expansion within the CENTUM VP Distributed Control System. It provides physical slot connectivity and electrical power distribution for field interface modules linked directly to the Field Control Station.
Suffix Breakdown & Model Matrix
Code Segment
Code
Meaning
Model
ANB11D
Dual-Redundant Node Unit (ESB / Optical ESB Bus)
Power Supply
-B
100 - 120 V AC
Type
2
Basic type
Coating / Mount
5
Standard, 19-inch rack mount
Option Code
/BU2A
Battery Unit for memory retention
Hardware Specifications
Parameter
Specification
Model Brand
Yokogawa ANB11D-B25/BU2A
Origin
Japan
Weight
Approx. 6.0 kg (without I/O modules)
Dimensions
19-inch rack mount standard
Operating Temp
0 to 50 degC
Power Consumption
Max. 200 VA (module dependent)
Power Supply Range
85 to 132 V AC, 47 to 63 Hz
Redundancy
Dual power modules
Bus Interface
ESB / Optical ESB Bus
Slot Capacity
Up to 8 I/O modules
Cooling
Natural convection
4-20 mA HART Loop Protocol Integration
The ANB11D supports integration with 4-20 mA HART-enabled I/O modules, maintaining analog signal integrity while embedding digital HART data packets onto the current loop. This enables simultaneous process measurement transmission and device diagnostics without altering existing wiring infrastructure. Channel isolation preserves signal accuracy by minimizing ground loop interference in multi-module configurations.
Frequently Asked Questions
Q: Can I replace a power supply module without shutting down the node?
A: Yes. The dual-redundant configuration allows hot-swap replacement of one power module while the second maintains operation.
Q: What happens to volatile memory during a total power outage?
A: The /BU2A battery unit retains critical status data for a limited period; however, battery condition must be verified per Yokogawa maintenance intervals.
Q: Does this node support optical ESB bus connections?
A: Yes. Compatible with both copper ESB bus cables and optical fiber ESB links depending on the connected Field Control Unit interface.
Field Installation Guidelines
Mount the node in a 19-inch rack using all provided securing points to prevent mechanical stress on connectors. Maintain minimum clearance at top and bottom for unrestricted airflow. Use shielded twisted-pair cables for ESB bus connections, grounding the shield at the controller end only. Route power and signal cables separately to minimize electromagnetic coupling. Verify torque specifications on terminal blocks during commissioning.
