Product Description

The SEC402-51 S1 is a high-integrity ESB Bus Coupler Module engineered for the Yokogawa ProSafe-RS Safety Instrumented System (SIS). It serves as a critical communication bridge between Safety Control Units (SCU) and Safety Node Units (SNU), providing dual-channel redundancy to ensure continuous data transfer in SIL3-rated safety loops.

The "51" suffix denotes a specialized hardware configuration optimized for mission-critical safety applications, delivering high-speed, reliable communication over the ESB bus. Compact and lightweight, the SEC402-51 S1 is ideal for high-density safety racks, enabling robust communication in hazardous and industrial environments.

Technical Specifications

Application Scenarios

• Connecting multiple safety I/O nodes to a central ProSafe-RS controller

• Ensuring redundant communication paths for emergency shutdown (ESD), Fire & Gas (F&G), and Burner Management Systems (BMS)

• Used in high-risk industries such as LNG processing, offshore drilling, and petrochemical plants

• Ideal for distributed safety architectures where node redundancy is essential

Frequently Asked Questions

Q1: What is the difference between SEC401 and SEC402 modules?
A: The SEC401 is typically installed in upstream Safety Control Units to initiate ESB bus extension, while the SEC402 is installed in downstream Node Units to receive and relay safety signals. Together, they maintain a redundant, SIL3-rated communication path.

Q2: Does this module support G3 conformal coating?
A: The S1 revision provides standard industrial protection. For environments with highly corrosive gases (e.g., H₂S, SO₂), verify whether a dedicated G3-rated version is required to ensure long-term reliability.