Description

Yokogawa ANB11D-225/BU2B Node Unit

The Yokogawa ANB11D-225/BU2B, also cataloged as the ANB11D Node Unit for Dual-Redundant ESB Bus with Optical Repeater, operates as a dedicated hardware component for extending Field I/O connectivity via fiber-optic links within Yokogawa CENTUM VP DCS platforms.

Suffix Breakdown & Model Matrix

Code Segment	Code	Meaning
Model	ANB11D	Node Unit for Dual-Redundant ESB Bus with Optical Repeater
Type	-2	Dual-redundant power supply, for 5 km optical repeater
Power Supply	-2	220 to 240 V AC power supply
Installation	-5	Basic type with no explosion protection
Option Code	/BU2B	Connector Unit with Terminator for ESB Bus

Hardware Specifications

Parameter	Specification
Brand	Yokogawa
Origin	Japan
Weight	Approx. 10.0 kg (fully populated)
Dimensions	19-inch rack mount
Operating Temp	0 to 60 degC (derates to 50 degC with specific comms modules)
Power Consumption	Approx. 230 VA / 120 W
Supply Voltage	220 to 240 V AC (Range: 198 to 264 V AC)
Frequency	50/60 Hz (Range: 47 to 63 Hz)
Distance Capability	Up to 5 km optical fiber link
Module Capacity	Up to 8 FIO modules

4-20mA Loop Protocol and Channel Isolation

The unit interfaces with standard Field I/O (FIO) modules supporting conventional 4-20 mA analog input and output signaling. When configured with HART-enabled FIO modules, the backplane facilitates digital communication superimposed on the analog current loop. Channel-to-channel isolation is maintained within the connected FIO modules to prevent ground loop interference between field devices. The integrated optical repeater converts electrical ESB bus signals to optical signals, ensuring data integrity over extended distances without electromagnetic susceptibility.

Frequently Asked Questions

Q: Does the ANB11D support hot-swapping of FIO modules?

A: FIO module hot-swapping capability depends on the specific module type installed; refer to the individual FIO module manual for live replacement restrictions. Power supply modules in the dual-redundant configuration can typically be replaced online.

Q: What is the function of the /BU2B option?

A: The /BU2B designates a connector unit with an integrated ESB bus terminator. This eliminates the requirement for external terminating resistors at the physical end of the ESB bus segment.

Q: Are there any cooling requirements for this unit?

A: Cooling is achieved via natural air convection. Ensure adequate clearance around the ventilation slots in the 19-inch rack to maintain ambient temperature limits.

Field Installation Guidelines

Mount the unit in a standard 19-inch rack using M5 screws. Ensure the functional grounding terminal (M4 screw) is connected to the panel's ground bus with minimal impedance. When routing the 5 km optical fiber, avoid tight bending radii exceeding the cable manufacturer's specifications to prevent signal attenuation. For ESD protection, ensure all field wiring to the FIO modules is disconnected before installation or removal of the node unit. Verify the power supply voltage matches the 220-240 V AC rating prior to energizing the unit.

Specifications

• Brand: Yokogawa

Advantages

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