Product Overview
The Yokogawa ANB11D-225 is an optical ESB (Extended Serial Backplane) bus node unit designed for the CENTUM VP distributed control system. Its primary function is to extend the ESB bus communication distance between field control units and remote I/O nodes through fiber optic technology. The ANB11D-225 serves as a critical communication bridge, converting electrical ESB signals into optical signals to achieve transmission distances up to 5 kilometers, effectively eliminating electromagnetic interference and ground potential differences that can compromise signal integrity .
As part of the ANB11D series, the Yokogawa ANB11D-225 is specifically engineered for use with AFV30 and AFV40 field control units. The unit accommodates up to eight FIO or N-IO modules and employs dual-redundant architecture for both power supply and ESB bus communication, ensuring continuous operation even if a single power module or fiber optic path fails . This redundancy is essential for critical process control applications where unexpected downtime is unacceptable.
The Yokogawa ANB11D-225 integrates an optical repeater slave module (ANT502 for 5 km range) that pairs with a master module (ANT401 or ANT411) installed in the FCU. The “-225” suffix designation indicates a 5-kilometer optical repeater capability, 220–240 V AC power supply, and basic type construction without explosion protection . When equipped with the /HU1A or /HU1B option, the unit can also transmit cabinet environmental information such as temperature and fan status back to the FCU for proactive monitoring .
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | ANB11D-225 |
| Manufacturer | Yokogawa |
| Product Type | Optical ESB Bus Node Unit with Dual-Redundant Repeater |
| System Compatibility | CENTUM VP / CENTUM CS 3000 |
| Maximum Transmission Distance | 5 km (via optical fiber) |
| Power Supply | Dual-redundant, 220–240 V AC, 50/60 Hz |
| Power Consumption | 230 VA / 120 W (maximum load) |
| I/O Capacity | Up to 8 FIO/N-IO modules |
| Optical Repeater Slave Module | ANT502 (5 km type) |
| Compatible FCU | AFV30, AFV40 |
| Bus Coupler Module | EC401 or EC402 (installed in FCU slots 7 and 8) |
| Mounting | 19-inch rack mount (M5 × 4 screws) |
| Weight | Approximately 10 kg (including 8 I/O modules) |
Main Features and Advantages
Long-Distance Optical Communication: The Yokogawa ANB11D-225 converts electrical ESB bus signals into optical signals, enabling I/O nodes to be deployed up to 5 kilometers from the central control room . This capability allows remote instrument enclosures to be placed close to field devices, significantly reducing analog signal cable lengths and eliminating signal degradation caused by electromagnetic interference or ground potential differences.
Dual-Redundant Architecture for High Availability: The employs dual-redundant power supplies operating in active-active configuration, ensuring uninterrupted operation if one power module fails . The ESB bus communication path is also dual-redundant, with two independent fiber optic links providing backup protection. When paired with EC401 or EC402 bus coupler modules in redundant configuration, the system can perform online maintenance without disrupting the production process .
Flexible I/O Configuration and Environmental Monitoring: The Yokogawa ANB11D-225 supports up to 8 FIO or N-IO modules, accommodating a wide range of analog input/output, digital input/output, and communication modules. When the /HU1A or /HU1B option is specified, the unit transmits cabinet environmental information—including temperature and fan status—to the FCU via the optical ESB bus, enabling remote health monitoring and proactive maintenance .
