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Yokogawa ANB11D-215/BU2A/NDEL ESB Bus Node Unit

Configured for deterministic I/O expansion in Yokogawa CENTUM VP distributed control systems, the Yokogawa ANB11D-215/BU2A/NDEL, also cataloged as the ANB11D Dual-Redundant ESB Bus Node Unit, provides direct physical and electrical execution of field signal interfacing via high-speed Extended Serial Bus communication links.

Suffix Breakdown & Model Matrix

Code Segment	Option / Value	Description
Model	ANB11D	Dual-Redundant ESB Bus Node Unit
Power Supply	-2	220 - 240 V AC Power Supply
Power Supply Config	1	Dual-redundant power supply
Seat / Comm	5	Basic type, standard communication
Option 1	/BU2A	Base Unit for 19-inch Rack Mounting (Dual-redundant)
Option 2	/NDEL	No digital explosion protection / Standard labeling

Hardware Specifications

Parameter	Specification
Model Brand	Yokogawa ANB11D-215/BU2A/NDEL
Origin	Japan
Weight	Approx. 5.0 kg (fully loaded)
Dimensions	19-inch rack mount standard
Operating Temp	0 to 50 degC
Power Consumption	220 - 240 V AC, 50/60 Hz
I/O Capacity	Up to 8 I/O modules
Bus Type	ESB (Extended Serial Bus)

Process Control & DCS Instrumentation Integration

The unit supports 4-20 mA HART loop protocol compatibility when paired with appropriate analog input/output modules, enabling seamless integration into existing CENTUM VP architectures. Channel-to-channel isolation is implemented within supported I/O modules to prevent ground loop interference and maintain measurement integrity under high-electrical-noise field conditions. Cold junction compensation is applied in thermocouple input configurations to ensure accurate temperature referencing at the termination points.

Frequently Asked Questions

Q: Does the ANB11D support hot-swapping of I/O modules while the ESB bus is active?

A: Yes, provided the I/O module type supports online replacement and the control station firmware permits it; power must remain stable during the swap.

Q: What is the redundancy switchover behavior if one power supply fails?

A: The secondary power supply assumes load without interruption; bus communication and I/O scanning continue unaffected.

Q: Are there restrictions on mixing different I/O module firmware revisions in the same node unit?

A: Firmware revisions must be compatible with the installed ESB interface module version; mismatched revisions may cause initialization faults.

Field Installation Guidelines

Mount the base unit in a 19-inch rack with unobstructed airflow paths above and below. Use separate conduit runs for power and signal wiring to minimize electromagnetic coupling. Terminate cable shields at the rack ground bus using low-impedance connections. Verify all power supply phases are correctly phased before energizing dual-redundant units. Perform gap voltage validation only after mechanical installation and prior to commissioning field devices.

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