Description

Product Overview

The YOKOGAWA SB401-10 is an ESB bus slave interface module for CENTUM VP / CS3000 FIO node units, designed to bridge FIO I/O modules and the Field Control Unit (FCU) over the ESB backplane bus. It transmits analog and discrete field data between the FIO node rack and the main DCS controller, supporting hot-swappable I/O modules and dual-redundant bus configurations for high availability. This hardware resolves communication bottlenecks and single-point failure risks in process DCS racks, enabling bumpless data transfer between field I/O and the control logic. Process control engineers and plant reliability teams rely on this module for spare replacement and system rebuilds in Yokogawa CENTUM DCS architectures. Front-panel diagnostic LEDs indicate ESB bus status, link health and fault alarms, accelerating troubleshooting during system commissioning and downtime events. Word count overview:172

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Technical Specifications

• Product Model: SB401-10
• Brand: Yokogawa
• Warranty: One Year
• Input Voltage: Powered by FIO node power supply (PW48 series)
• Operating Temperature: 0 °C to 60 °C
• Storage Temperature: -40 °C to 85 °C
• Response Time: High-speed ESB bus cyclic data transmission
• Protection Class: IP20, rack-mounted inside FIO node unit
• Accuracy Class: Not applicable (bus interface slave module)
• Output Frequency: Not applicable
• Rated Current Range: Low power consumption supplied by node power rack
• Communication Interface: ESB bus port; FIO internal backplane connector
• Supported Protocols: ESB bus protocol for CENTUM FIO system
• Overload Capacity: Bus surge suppression, ESD protection, link failure detection
• Dimensions: Standard FIO module form factor for ANB10 series node unit
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Application Scenarios

• Refinery DCS FIO Node Redundant Communication: This ESB slave module links FIO I/O racks to the FCU for crude distillation unit monitoring. The SB401-10 supports dual redundant pair installation to maintain continuous data communication if one bus channel fails.
• Power Plant Boiler DCS Control Rack: Installed in ANB10D FIO node units, the module carries analog transmitter and discrete valve feedback signals to the DCS field control station. Redundant bus design prevents loss of critical boiler instrumentation data.
• Chemical Batch Process Control: The module serves as the communication gateway for reactor pressure, temperature and safety interlock I/O modules. Hot swap capability allows replacement of I/O boards without shutting down the DCS node.

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Key Product Notes

This SB401-10 slave module fits ANB10 series FIO node units and works together with EC401/EC402 ESB bus coupler modules. Two SB401 modules are required for dual-redundant ESB bus architecture. Yokogawa supplies spare stock for legacy CENTUM VP and CS3000 DCS maintenance. ESD protection must be followed during module replacement; verify ESB cable integrity and bus LED status after installation to avoid intermittent communication failures.