Product Overview

The Yokogawa ANT411-50 S1 is a high-performance Optical ESB Bus Repeater Module designed for the CENTUM VP Distributed Control System (DCS). This module serves as a critical communication bridge, converting standard electrical ESB bus signals into optical signals for long-distance transmission. By utilizing fiber optic technology, the ANT411-50 S1 enables the extension of the control network between Field Control Units (FCUs) and remote Node Units, overcoming the distance limitations of traditional copper cabling.

Specifically engineered for master-side installation within a controller nest, this module ensures high-speed, deterministic data exchange across expansive industrial sites. The use of optical communication provides total galvanic isolation, making the system immune to electromagnetic interference (EMI) and lightning-induced surges, which is vital for maintaining network integrity in hazardous or electrically noisy environments.

Technical Specifications

• Manufacturer: Yokogawa Electric Corporation

• Model Number: ANT411-50 S1

• Module Type: Optical ESB Bus Repeater (Master Side)

• System Range: CENTUM VP

• Communication Interface: Optical Fiber Port

• Transmission Speed: 128 Mbps

• Maximum Distance: Up to 5 km (depending on fiber type and configuration)

• Cable Type: Multi-mode or Single-mode fiber optic (application specific)

• Redundancy: Supports dual-redundant configuration for mission-critical links

• Current Consumption: 0.5 A or less (at 5V DC)

• Weight: 0.28 kg

• Dimensions: 3.2 x 10.7 x 13 cm

• Origin: Japan

Key Technical Characteristics

Extended Network Topology

The ANT411-50 S1 allows for a distributed I/O architecture by significantly extending the physical reach of the ESB bus. This is essential for large-scale facilities such as refineries, offshore platforms, and power plants where I/O nodes are situated in satellite instrument houses far from the central control room.

Total Electrical Isolation

By converting data into light pulses, the module eliminates ground loop issues and prevents electrical faults in one part of the plant from propagating to the central controller. This optical isolation significantly enhances the reliability of the DCS backbone in environments with heavy motor loads or frequent lightning activity.

Redundancy and High Availability

For systems requiring zero-downtime, the ANT411-50 S1 can be deployed in a redundant pair. If the primary optical link is severed or the module fails, the system automatically switches to the backup link without interrupting process control. This ensures continuous visibility and management of field assets.

Simplified Diagnostics and Setup

The module features front-facing LED status indicators for "LINK" and "ERROR" states, providing immediate feedback on fiber optic connection quality and hardware health. Its plug-and-play design within the CENTUM VP rack facilitates rapid installation and simplifies hardware commissioning during system expansions.