Description

Yokogawa ANB11D-225/BU2A ESB Bus Node Unit

Configured for dual-redundant ESB bus expansion in Yokogawa CENTUM VP systems, the Yokogawa ANB11D-225/BU2A (ANB11D ESB Bus Node Unit) provides direct physical and electrical execution of I/O aggregation tasks.

Suffix Breakdown & Model Matrix

Code Section	Selection	Meaning
Model	ANB11D	Node Unit for Dual-Redundant ESB Bus
Power Supply	-2	220–240 V AC Power Supply
Power Redundancy	2	Dual-redundant power supply
Safety/Compliance	5	Basic type with CE marking and UKCA marking
Option Code	/BU2A	19-inch Rack Mountable (EIA standard support)

Hardware Specifications

Parameter	Specification
Model Brand	Yokogawa ANB11D-225/BU2A
Origin	Japan
Weight	Approx. 10 kg
Dimensions	482.6 (W) x 132.5 (H) x 310 (D) mm
Operating Temp	0 to 50 degC
Power Consumption	Max. 130 VA
Supply Voltage	220 to 240 V AC (180 to 264 V AC range)
Frequency	50/60 Hz +/- 3 Hz
I/O Slots	8 slots (2 dedicated to ESB Interface Modules)
Bus Redundancy	Dual-redundant ESB bus cables

Channel-to-Channel Isolation and Cold Junction Compensation

The ANB11D supports FIO modules with integrated channel-to-channel isolation to suppress ground loop currents. Compatible analog input modules execute cold junction compensation to maintain thermocouple measurement accuracy. Backplane communication velocity remains deterministic under full I/O loading, ensuring consistent data transfer to the Field Control Unit.

Frequently Asked Questions

Q: Can I/O modules be replaced while the node unit is powered?

A: Only modules explicitly rated for hot-swap operation may be changed online; otherwise, power-down is required to avoid backplane transients.

Q: What occurs if one ESB bus cable is damaged?

A: The dual-redundant ESB bus automatically switches to the remaining active cable without interrupting I/O processing.

Q: Is firmware upgrade required when integrating with newer FCU models?

A: Firmware compatibility must be verified against the CENTUM VP engineering manual; mismatched revisions may cause communication faults.

Field Installation Guidelines

Secure the unit in a 19-inch rack using all provided mounting points. Maintain unobstructed airflow around ventilation openings. Use shielded twisted-pair cables for ESB bus connections, grounding shields only at the node end. Confirm input voltage is within the 180–264 V AC range prior to energizing. Ensure total I/O module current draw does not exceed the node’s internal power budget.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems