The Yokogawa ANB11D Optical ESB Bus Node Unit is a dual-redundant fiber optic ESB bus node designed for Yokogawa CENTUM VP and CENTUM CS 3000 Field I/O (FIO) systems. Unlike the ANB10D, which communicates through copper ESB bus connections, the ANB11D incorporates optical ESB repeater modules to provide long-distance fiber optic communication between the Field Control Unit (FCU) and distributed Field I/O nodes. It supports redundant power supplies, redundant optical communication paths, and installation of FIO power supply modules, ESB interface modules, and analog or digital I/O modules. This architecture provides excellent noise immunity, electrical isolation, and reliable communication over distances up to 5 km or 50 km, depending on the installed optical repeater modules.

Contents

• 1. Product Overview
• 2. Main Features
• 3. Typical Applications
• 4. Installation Preparation
• 5. Node Unit Installation
• 6. Optical ESB Bus Wiring
• 7. System Configuration
• 8. Commissioning Procedure
• 9. Functional Verification
• 10. Preventive Maintenance
• 11. Practical Installation Case
• 12. Frequently Asked Questions

Product Overview

The ANB11D functions as a remote Field I/O node connected to the FCU through a dual-redundant Optical ESB Bus. It accommodates power supply modules, ESB slave interface modules, optical repeater modules, and various FIO analog and digital I/O modules. Optical communication provides excellent resistance to electromagnetic interference while supporting long-distance installation between control rooms and remote process areas. Depending on the selected suffix code, the unit supports optical repeater systems for approximately 5 km or 50 km transmission distances.

Main Features

• Dual-redundant Optical ESB Bus architecture
• Fiber optic communication for long-distance transmission
• Supports redundant power supplies
• High immunity to electromagnetic interference
• Electrical isolation through optical transmission
• Supports Yokogawa FIO analog and digital I/O modules
• High-availability industrial design
• Continuous 24-hour industrial operation

Typical Applications

• Large refinery automation systems
• Offshore oil and gas platforms
• LNG terminals
• Pipeline monitoring stations
• Power generation facilities
• Chemical processing plants
• Remote field I/O installations
• Industrial facilities requiring long-distance optical communication

Installation Preparation

• Verify the ANB11D model and suffix code.
• Select the appropriate optical repeater type (5 km or 50 km).
• Prepare redundant fiber optic cables.
• Verify compatible power supply and ESB interface modules.
• Inspect fiber optic connectors.
• Confirm cabinet grounding.
• Review approved system drawings.

Node Unit Installation

1. Mount the ANB11D securely in the equipment cabinet.
2. Install redundant power supply modules.
3. Install the ESB slave interface module.
4. Install the optical ESB repeater module.
5. Install required analog and digital I/O modules.
6. Connect redundant optical ESB fibers.
7. Inspect all electrical and optical connections.

Optical ESB Bus Wiring

• Connect Optical ESB Bus A and Bus B.
• Clean fiber connectors before connection.
• Observe minimum fiber bending radius.
• Separate optical cables from power wiring.
• Verify optical connector polarity.
• Label redundant optical paths clearly.

System Configuration

• Configure Optical ESB node addresses.
• Assign installed I/O modules.
• Configure redundant communication.
• Download controller configuration.
• Verify node recognition.
• Review communication diagnostics.

Commissioning Procedure

VERIFY NODE INSTALLATION
CHECK POWER SUPPLIES
VERIFY OPTICAL CONNECTIONS
INSTALL I/O MODULES
POWER UP SYSTEM
VERIFY NODE STATUS
TEST OPTICAL COMMUNICATION
CONFIRM NORMAL OPERATION

Functional Verification

• Confirm node recognition by the FCU.
• Verify both optical communication channels.
• Confirm all installed I/O modules are detected.
• Verify redundant communication switchover.
• Check optical communication diagnostics.
• Perform complete field signal testing.

Preventive Maintenance

• Inspect fiber optic connectors regularly.
• Clean optical connector end faces.
• Verify redundant communication status.
• Inspect module seating.
• Check cabinet ventilation.
• Review DCS communication diagnostics.

Practical Installation Case

During construction of a large LNG export terminal, multiple remote instrument buildings were connected to the Yokogawa CENTUM VP control system using ANB11D Optical ESB Bus Node Units. Dual-redundant fiber optic cables linked each node to the central control room over several kilometers.

After commissioning:

• Both optical communication paths operated normally.
• All Field I/O modules were recognized immediately.
• No communication errors were observed despite high electromagnetic interference from nearby electrical equipment.
• The redundant optical architecture ensured uninterrupted process control throughout system testing.

Frequently Asked Questions

What is the primary function of the ANB11D?

The ANB11D provides a dual-redundant fiber optic ESB communication node for Yokogawa Field I/O systems, housing power supplies, optical repeater modules, ESB interface modules, and I/O modules while maintaining reliable long-distance communication with the FCU.

What is the difference between the ANB10D and ANB11D?

The ANB10D uses conventional copper ESB bus communication, whereas the ANB11D communicates through redundant fiber optic ESB bus repeater modules, providing greater transmission distance, electrical isolation, and immunity to electromagnetic interference.

Which optical transmission distances are supported?

Depending on the installed optical repeater modules and suffix code, the ANB11D supports optical communication systems designed for approximately 5 km or 50 km transmission distances.

Summary

The Yokogawa ANB11D Optical ESB Bus Node Unit provides a highly reliable fiber optic communication platform for distributed Field I/O in Yokogawa CENTUM systems. Proper installation, redundant optical cabling, secure module installation, accurate node configuration, and comprehensive commissioning ensure dependable long-distance communication, excellent electromagnetic immunity, and continuous operation in critical industrial applications.