Yokogawa SB401-50 ESB Bus Interface Slave Module

July 17, 2026 • 3 min read • wayne • Guide

Product Summary

The Yokogawa SB401-50 is a critical ESB Bus Interface Slave Module for distributed control systems. This module connects ESB Bus Node Units to the Field Control Unit (FCU). It supports a standard type with no explosion protection. You get a new, original product in factory packing. This module ensures reliable data transmission in your industrial process.

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Understanding the SB401-50 Suffix Codes

You must select the correct suffix codes for your system. The SB401-50 model uses the `-5` suffix for standard applications. This suffix means the module offers no explosion protection. It is the basic type for general industrial environments. Always verify your system’s safety requirements before ordering. This ensures you avoid costly compatibility issues later.

Power Supply Selection for Your System

You must specify the power supply voltage with the correct suffix code. This module accepts three distinct power input options. You can choose between 100-120 V AC or 220-240 V AC. A 24 V DC option is also available for your system. Each voltage option has a specific power consumption rating. For AC models, consumption is 200 VA or 230 VA. The DC model draws a steady 5.5 Amps. Check your existing cabinet power budget carefully.

ESB Bus Node Connection Requirements

Proper installation requires specific hardware for the FCU. You must install an ESB Bus Coupler Module in slot 7. This is essential for connecting your SB401-50 slave module. Slot 8 requires a second coupler for redundant configurations. For a single configuration, you must leave slot 8 empty. Compatible FCU models include the A2FV50 and A2FV70 series. Always confirm your FCU model before installation begins.

Physical Specifications and Weight

The module has a substantial weight of approximately 10 kilograms. This weight includes the base unit and eight I/O modules. Plan your cabinet layout to support this physical load. Ensure your mounting rails can handle the total system weight. Proper planning prevents mechanical stress on the backplane.

Ordering the Correct Part

When ordering, use the exact part number SB401-50 for your purchase. This ensures you receive the standard type module. Confirm the product is new and in original factory packing. This guarantees the unit meets Yokogawa’s strict quality standards. A 12-month factory warranty protects your investment. Always order from an authorized distributor for authenticity.