Product Overview

The Yokogawa SSB401-53 S1 is a high-performance Optical ESB Bus Repeater Master Module designed for the CENTUM VP and CS 3000 Distributed Control Systems (DCS). This module serves as the primary gateway for extending the reach of the Extended Serial Backplane (ESB) bus via fiber optic cabling. By converting electrical signals into optical pulses, the SSB401-53 S1 allows for the integration of remote I/O nodes that are located beyond the distance limitations of standard copper wiring. It is an essential component for geographically dispersed plant architectures, providing the high-speed data backbone necessary for real-time process monitoring and control.

Technical Characteristics

This master repeater module is engineered to provide reliable, long-distance communication with high noise immunity.

Flexible Network Topologies The SSB401-53 S1 supports both Star and Chain (daisy-chain) network configurations. This versatility enables system engineers to design efficient fiber routes that match the physical layout of the facility, whether the remote nodes are clustered in different buildings or distributed along a linear pipeline.

Long-Distance Transmission Utilizing a 1300 nm optical wavelength, the module can transmit safety-critical and process data over distances of up to 2 kilometers (approx. 1.24 miles) per segment. This optical transmission provides total galvanic isolation between system nodes, shielding the control network from lightning strikes, ground loops, and electromagnetic interference (EMI).

Deterministic Performance Despite the extended distances, the module maintains a steady data rate of 10 Mbps, ensuring that the I/O refresh cycles remain deterministic. This is critical for maintaining the high-speed control loops required in power plants and chemical refineries. The module is also designed for high availability, supporting redundant configurations when installed in pairs within the Field Control Unit (FCU).

Technical Specifications

• Brand: Yokogawa

• Model Number: SSB401-53 S1

• Product Type: Optical ESB Bus Repeater Master Module

• Optical Wavelength: 1300 nm

• Maximum Transmission Distance: 2 km (per segment)

• Data Rate: 10 Mbps

• Power Requirements: 5 V DC (5W to 12W consumption)

• Operating Temperature: 0°C to +55°C

• Weight: 0.3 kg

• Dimensions: 3.3 x 10.7 x 13.0 cm

• Origin: Japan

Application Areas

The Yokogawa SSB401-53 S1 is predominantly utilized in large-scale industrial complexes where centralized controllers must manage distributed I/O racks. Key applications include:

• Oil and Gas Refineries: Interconnecting remote tank farm I/O with the central control room.

• Power Generation: Linking turbine control subsystems across large plant floors.

• Water Treatment Facilities: Managing geographically separated pumping stations and filtration units.

• Chemical Manufacturing: Providing noise-immune communication in environments with high electrical motor activity.