Product Details

The Yokogawa SSB401-13 is a high-performance Optical ESB Bus Repeater Module designed for the CENTUM VP and CS 3000 Distributed Control Systems (DCS). This module extends the communication reach between Field Control Stations (FCS) and remote I/O nodes via optical fiber. We provide this unit as 100% brand new and original, ensuring stable, long-distance signal transmission in mission-critical industrial networks.

Product Overview

The SSB401-13 serves as the backbone for distributed I/O architectures. It converts electrical ESB bus signals into optical signals, allowing the DCS to connect remote I/O units located several kilometers away from the main controller. By utilizing optical fiber, the SSB401-13 provides total electrical isolation between segments, effectively eliminating ground loop issues and protecting the system from lightning strikes or heavy electromagnetic interference (EMI). This module is essential for large-scale refineries, offshore platforms, and expansive power plants where field devices reside far from the central control room.

Part Number Breakdown

The SSB401 series uses specific suffixes to define its technical capabilities:

• SSB401: Base model for the Optical ESB Bus Repeater.

• -13: Designates the specific version and optical port configuration.

• S1: Indicates the hardware style and revision for system-level compatibility.

Technical Specifications

Engineering Advantages

• Immunity to EMI/RFI: Because the SSB401-13 transmits data via optical fiber rather than copper, it remains completely unaffected by high-voltage equipment noise. This ensures uncorrupted data transmission in environments with large VFDs, motors, or power transformers.

• Extended Transmission Distance: This module overcomes the physical distance limitations of standard copper ESB cables. It allows engineers to place I/O racks at remote sites while maintaining the same deterministic performance as locally mounted I/O.

• Total Electrical Isolation: Optical fiber provides a non-conductive path between the FCS and remote nodes. This prevents dangerous ground potential differences between different plant areas and protects the core controller from field-side electrical surges.

• Redundant Path Support: The SSB401-13 integrates into the Yokogawa redundant bus architecture. In the event of a fiber break, the system automatically routes data through the secondary repeater module, ensuring zero downtime for the control process.

• Rugged Japanese Engineering: Built for continuous 24/7 operation, the SSB401-13 withstands harsh industrial temperatures and vibration. Its 0.9 kg robust frame fits securely into standard Yokogawa station cabinets.

FAQs

Does the SSB401-13 require a specific type of optical fiber?

Yes. You should use high-quality multi-mode or single-mode fiber as specified in the Yokogawa hardware manual to match the module's optical transceiver specifications. Using the correct fiber ensures the module maintains its rated transmission distance and signal strength.

Can I mix SSB401-13 with older bus repeater models?

The SSB401-13 Style S1 is designed for modern CENTUM VP and CS 3000 hardware. To maintain full redundancy and bus timing synchronization, we recommend using identical models at both ends of the optical link (e.g., pairing an SSB401 with another SSB401).

What diagnostics are available on the module?

The SSB401-13 features front-panel status LEDs that indicate link activity and hardware health. Additionally, the CENTUM VP software provides detailed bus diagnostics, reporting signal attenuation or link failures directly to the Engineering Station.

How does this module handle power loss?

The SSB401-13 draws power from the station backplane. If the station has a redundant power supply, the repeater remains active. During a total power loss, the optical link will drop, and the FCS will trigger a "communication fail" alarm for the affected remote I/O segment.