Product Overview

The Yokogawa SNT411-13 operates as a high-performance Optical ESB Bus Repeater Master Module for CENTUM VP and ProSafe-RS Distributed Control Systems. This module converts electrical ESB bus signals into high-integrity optical data, facilitating long-distance communication between Safety Control Units and remote N-IO or Safety Node Units. By pairing the SNT411-13 with an SNT511 slave unit, engineers extend the reach of the system architecture across expansive industrial complexes without compromising signal velocity or safety integrity.

Condition: 100% Brand New, Factory Sealed Original.

Part Number Breakdown: SNT411 Series

Yokogawa uses specific suffix codes to define transmission capabilities and hardware revisions for the SNT master series.

Technical Specifications

The SNT411-13 provides a low-latency bridge between decentralized control nodes using advanced fiber optic technology.

• Primary Function: Electrical-to-Optical ESB Bus Signal Conversion

• Transmission Distance: 5 km to 50 km (requires paired SNT511)

• Compatible Slave: SNT511 Optical ESB Bus Repeater Slave

• System Compatibility: CENTUM VP / ProSafe-RS / S2EN501 N-ESB

• Operating Temp: 0°C to +50°C

• Storage Temp: -20°C to +70°C

• Humidity: 5% to 95% RH (Non-condensing)

• Weight: 0.3 kg (0.66 lbs)

• Origin: Japan

Engineering Advantages

• Expansive Site Coverage: The SNT411-13 enables communication over distances up to 50 km. This allows operators to manage remote offshore platforms, expansive tank farms, or distributed substations from a centralized control room, removing the cost of localized satellite processors.

• Absolute EMI Immunity: By replacing copper cabling with optical fiber for long-haul runs, the SNT411-13 isolates the ESB bus from lightning strikes, high-voltage surges, and electromagnetic noise. This ensures 100% signal availability in electrically hostile environments.

• Precision Safety Integration: This module adheres to the strict timing requirements of the ProSafe-RS safety bus. It converts safety-critical signals into light pulses without introducing significant latency, ensuring Emergency Shutdown (ESD) commands execute within the millisecond windows required for SIL3 certification.

• Compact Integration: Despite its sophisticated conversion capabilities, the SNT411-13 maintains a standard FIO slot width of 32.8 mm. This space-efficient footprint allows engineers to add long-distance capabilities to existing Field Control Unit (FCU) racks without requiring additional cabinet space.

FAQs

• Can I connect the SNT411-13 to standard commercial fiber switches?

  No. The SNT411-13 utilizes a proprietary Yokogawa ESB bus protocol. You must establish a direct fiber connection to a paired Yokogawa SNT511 Slave Module to correctly decode and re-convert the optical signals.

• Does the module require manual distance configuration?

  Most SNT master modules automatically synchronize with the signal timing of the fiber run. However, for distances near the 50 km limit, you must verify fiber attenuation (dB loss) to confirm the signal falls within the module's receiver sensitivity range.

• What distinguishes the SNT411-13 from the SNT411-5F?

  The -13 revision serves as the updated master module baseline for modern N-IO and ProSafe-RS architectures. While they perform similar functions, the -13 version offers superior compatibility with the latest S2EN501 N-ESB bus modules.

• Is hot-swapping supported for this module?

  Yes, provided you have configured the ESB bus repeater modules in a redundant pair. You can replace a faulty SNT411-13 without interrupting communication to remote nodes as long as the secondary fiber link remains active and healthy.