SB401-50 YOKOGAWA CENTUM ESB Bus Interface Slave Module

The YOKOGAWA SB401-50, also cataloged as the SB401 ESB Bus Interface Slave Module, operates as a dedicated hardware component for ESB bus signal interfacing and remote I/O data communication within Yokogawa CENTUM control system networks.

Suffix Breakdown & Model Matrix

The model and suffix configuration code structure for the SB401 module defines specific hardware features and safety type ratings:

• Base Model (SB401): ESB Bus Interface Slave Module
• Explosion Protection (-5): Standard type with no explosion protection
• Option Code (0): Basic type specification

Hardware Specifications

Channel-to-Channel Isolation and 4-20 mA Loop Signal Handling

The SB401-50 module incorporates galvanic isolation rated at 2000 VAC for 2 minutes across input, output, and power supply stages. This isolation architecture suppresses common-mode noise and prevents ground loop currents from degrading analog signal channels. Designed for integration with 4-20 mA HART loop protocol instruments and DC voltage sources (-30 to +30 V), the interface converts field signals with a conversion accuracy of +/-0.1% of span over the ESB bus architecture.

Frequently Asked Questions

Q: What power supply range is compatible with the SB401-50 module?

A: The module accommodates wide-range AC input from 85 to 264 VAC at 50/60 Hz, as well as DC input voltages spanning 100 to 370 VDC.

Q: What galvanic isolation rating applies to the signal lines and power supply?

A: The SB401-50 provides 2000 VAC galvanic isolation for 2 minutes between input, output, and power supply terminals.

Q: What does the -50 suffix code indicate on the SB401 module?

A: The "-5" suffix specifies a standard type without explosion protection, while the "0" suffix indicates the basic module hardware configuration.

Field Installation Guidelines

Isolate all external power feeds before installing or wiring the SB401-50 module. Mount the module into the designated node unit slot, ensuring backplane connectors align cleanly before pushing the board into position. Tighten top and bottom panel retention screws to maintain ground continuity with the rack chassis. Wire input and output signal lines using shielded twisted-pair conductors, terminating shielding drains at a single cabinet earth ground bar. Maintain physical separation between signal cabling and high-voltage AC power conductors.