SSB401-13 Yokogawa ProSafe-RS ESB Bus Interface Module

Product Overview

The Yokogawa SSB401-13 functions as a high-performance ESB Bus Interface Module designed specifically for the ProSafe-RS Safety Instrumented System (SIS). This module facilitates the connection between Safety Control Units and remote Safety Node Units. It integrates seamlessly with optical repeaters like the SNT411 to extend safety bus signals over vast distances, ensuring deterministic communication and high-integrity data transport for critical emergency shutdown (ESD) and fire and gas (F&G) applications.

Part Number Breakdown

Yokogawa utilizes specific suffixes to define the hardware configuration and termination requirements:

Technical Specifications

The SSB401-13 maintains strict electrical and optical parameters for safety-critical networking:

• Manufacturer: Yokogawa

• Series: ProSafe-RS

• Connection Topology: Supports Star-type and Chain-type connections (simultaneous use permitted)

• Maximum Connection Stages: 2 Stages

• Transmission Distance: Extends from 5 km up to 50 km (via two-stage optical repetition)

• Power Consumption: 0.5 A (at 5 V DC)

• Optical Attenuation Range: 3 dB to 4 dB (Inter-module standard)

• Weight: Approx. 0.3 kg

• Condition: 100% Brand New and Original

Engineering Advantages

• Extended Reach for Large-Scale Facilities: When paired with optical bus repeaters, the SSB401-13 enables safety nodes to reside up to 50 km away from the central controller. This capability solves the challenge of protecting remote satellite instrument houses in massive petrochemical complexes or offshore networks.

• Hybrid Topology Flexibility: This module supports both star and chain topologies simultaneously. Engineers utilize this flexibility to optimize cable routing within the plant, reducing total fiber installation costs while maintaining redundant communication paths.

• Integrated Signal Integrity Management: The module architecture accounts for optical power attenuation. To prevent receiver saturation and signal errors, technicians must install a 3 dB attenuator if the fiber link attenuation drops below 3 dB, ensuring the SSB401-13 receives a perfectly balanced signal.

• Simplified Safety Node Integration: The SSB401-13 plugs directly into the Safety Node Unit. Its high-speed backplane interface ensures that the safety processor treats remote I/O data with the same priority and speed as local I/O, maintaining the required Safety Integrity Level (SIL).

FAQs

• Is the Yokogawa SSB401-13 unit brand new?

  Yes. We supply this unit as 100% Brand New and Original. Every module ships in its original Yokogawa factory box with the manufacturer's quality control seals intact.

• Does the SSB401-13 include an internal terminator?

  The "-13" suffix specifies the hardware version; however, you must verify if your specific part number includes the "/T" (Terminated) or "/NT" (Non-Terminated) option. Use the terminated version only at the end of an ESB bus chain to prevent signal reflection.

• What happens if my optical fiber link is too short?

  If your fiber link measures less than 3 dB of attenuation, you must install an external 3 dB attenuator. Failure to do so may result in excessive optical power reaching the module, potentially causing communication errors or hardware damage.

• Can I use the SSB401-13 with standard CENTUM DCS modules?

  While the ESB bus shares some physical characteristics with DCS buses, the SSB401-13 is specifically designed for the ProSafe-RS safety system. Always verify software and hardware compatibility in the ProSafe-RS engineering station before installation.