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Yokogawa ANB11D-215/BU2A Optical ESB Bus Node Unit

The Yokogawa ANB11D-215/BU2A, also cataloged as the ANB11D Optical ESB Bus Node Unit, operates as a dedicated hardware component for optical extension of the ESB bus within the CENTUM VP Distributed Control System.

Suffix Breakdown & Model Matrix

Code	Definition
ANB11D	Optical ESB Bus Node Unit, dual-redundant type for FIO
-2	Dual-redundant power supply, supports 5 km optical repeater
1	100 - 120 V AC power supply
5	Basic type, no explosion protection
/BU2A	Includes ESB Bus Connector Unit

Hardware Specifications

Parameter	Specification
Model Brand	Yokogawa ANB11D-215/BU2A
Origin	Japan
Weight	Approx. 10 kg (fully loaded with 8 I/O modules)
Dimensions	482.6 mm width × 132.5 mm height (3U) × standard rack depth
Operating Temp	0 to 60 degC
Power Consumption	Approx. 200 VA / 120 W
Transmission Distance	Up to 5 km via optical fiber
I/O Slots	8 slots for FIO modules
Network Topology	Chain and star configurations supported
Power Supply Voltage	100 - 120 V AC (range: 85 - 132 V AC)
Frequency	50 / 60 Hz ± 3 Hz
Insulation Resistance	≥ 20 MΩ at 500 V DC
Mounting	19-inch rack, secured with 4 × M5 screws
Connection Type	M4 screw terminals for power and ground

4-20 mA HART Loop Protocol Integration

The ANB11D-215/BU2A supports integration with 4-20 mA HART loop protocol infrastructures when paired with compatible analog I/O modules. Signal integrity is maintained through channel-to-channel isolation, minimizing crosstalk and ensuring deterministic measurement updates across the optical ESB segment. This configuration enables field device parameterization and diagnostics without interrupting process control loops.

Frequently Asked Questions

Q: Does the unit support hot-swapping of I/O modules?

A: No. All I/O modules must be installed or removed only after the node unit is de-energized to prevent backplane damage.

Q: What is the redundant bus switchover behavior during fiber failure?

A: The dual-redundant optical paths automatically switch without loss of data continuity; however, detection and rerouting occur within the system scan cycle time.

Q: Are firmware updates possible in the field?

A: Firmware revisions are fixed per hardware build; updates require replacement of the node unit or specific service procedures from Yokogawa engineering staff.

Field Installation Guidelines

Install the ANB11D-215/BU2A into a standard 19-inch rack using four M5 screws. Ensure the rack frame is bonded to the facility ground grid with a minimum 6 mm² conductor. Route optical fibers with a minimum bend radius of 30 mm to avoid attenuation. Separate power and signal cables by at least 300 mm to reduce electromagnetic interference. Terminate all shielding at the node unit ground terminal with secure M4 screw connections. Verify insulation resistance prior to energizing the unit.

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