SNT401-53 | Yokogawa Optical ESB Bus Repeater Module

Overview

The Yokogawa SNT401-53 Optical ESB Bus Repeater Master Module is a critical component designed for extending the communication distance of the ESB Bus in Yokogawa’s ProSafe-RS safety systems. The module provides reliable optical signal transmission, facilitating data flow between safety controllers and nodes across distances up to 10 km, depending on system configuration. This master module pairs with the SNT501 Optical ESB Bus Repeater Slave Module, supporting both star and chain-type network topologies.

Function and Compatibility

• Primary Function: Optical signal transmission over the ESB Bus, enhancing the connectivity and reach of safety control systems.
• Compatibility: Connects with various Yokogawa safety control units and node models, including SSC10S/D, SNB10D, SSC50S/D, SSC57S/D, SSC60S/D, S2SC70S/D, SNT10D.
• Connection Requirements: Links from the ESB Bus Coupler Module (SEC401, SEC402) on the safety control unit or the ESB Bus Interface Module (SSB401) on the safety node (SNB10D) via an ESB Bus cable.
• Types: Available with or without a terminator.

Standard Specifications

Connection and Network Configuration

• Connection Method: Supports both star and chain-type network topologies.
• Maximum Connecting Stages:
  • Two stages for chain-type connections.
  • In Vnet/IP systems with R1.03 or later, the combined two-stage distance can reach up to 10 km.

Transmission Distance

• Standard Transmission Range: Up to 5 km (two stages total).
• Extended Transmission Range (for Vnet/IP systems with R1.03 or later): Up to 10 km in total for two stages.

Power and Dimensions

• Current Consumption: 0.5 A.
• Weight: Approximately 0.3 kg, making it lightweight and easy to install.

Environmental Specifications

The SNT401-53 module operates under a wide range of environmental conditions, ensuring performance reliability in demanding industrial settings.

• Operating Temperature: -20°C to 70°C (ISA Standard G3 compatible).
• Corrosion Protection: Compliant with ANSI/ISA S71.04 G3 standards, enhancing durability in environments with corrosive gases.

Model and Suffix Codes

Model	Description
SNT401	Optical ESB Bus Repeater Master Module

Suffix Code	Description
-5	Standard model, no explosion protection
3	ISA G3 standard and temperature range (-20°C to 70°C)

Master and Slave Pairing

For proper operation, the SNT401-53 (master module) must be paired with a compatible SNT501-53 (slave module), ensuring that optical signals are properly received and transmitted along the ESB Bus network.

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