Yokogawa EC401-50 S3 H1 Bus Coupler – FOUNDATION Fieldbus H1 Coupler Module for CENTUM VP DCS
When a bus coupler fails in a FOUNDATION Fieldbus H1 segment, the consequences are immediate and severe: field devices lose communication, control loops go open, and operators are left flying blind in the middle of a live process. In continuous manufacturing environments—refineries, chemical plants, LNG terminals—even a few minutes of uncontrolled operation can trigger emergency shutdowns, product loss, or safety incidents. The Yokogawa EC401-50 S3 Bus Coupler is the critical link that keeps your H1 fieldbus segment alive, stable, and fully communicating with the CENTUM VP distributed control system.
The EC401-50 S3 occupies a precise technical niche within Yokogawa’s CENTUM VP architecture: it is the dedicated H1 bus coupler designed to interface between the high-speed HSE (High Speed Ethernet) backbone and the 31.25 kbit/s H1 fieldbus segments where smart field instruments reside. As FOUNDATION Fieldbus technology underpins mission-critical process automation across the globe—from petrochemical complexes in the Middle East to pharmaceutical plants in Europe—the EC401-50 S3 has established itself as a trusted, field-proven component in thousands of installations worldwide.
Technical Specifications
- Model / SKU: EC401-50 S3
- Manufacturer: Yokogawa Electric Corporation
- Series: CENTUM VP / FOUNDATION Fieldbus H1
- Function: H1 Bus Coupler (HSE to H1 segment interface)
- Fieldbus Standard: FOUNDATION Fieldbus H1 (IEC 61158)
- Communication Speed (H1): 31.25 kbit/s
- Weight: 220 g
- Compatibility: Yokogawa CENTUM VP DCS platform
- Mounting: DIN rail / system rack (per CENTUM VP installation standard)
- Operating Environment: Industrial control room / marshalling cabinet
Note: All specifications are based on Yokogawa official documentation. Do not rely on third-party sources for safety-critical parameter values.
Key Features & Benefits
- Seamless HSE-to-H1 Bridging: Provides reliable protocol conversion between the high-speed Ethernet backbone and H1 fieldbus segments, ensuring deterministic communication with all connected field devices.
- CENTUM VP Native Integration: Engineered specifically for Yokogawa’s CENTUM VP platform, guaranteeing full compatibility with system configuration tools, diagnostics, and firmware updates.
- High Segment Stability: Maintains stable bus voltage and signal integrity across the H1 segment, reducing noise-induced communication errors in electrically harsh industrial environments.
- Hot-Swap Capable Architecture: Supports the CENTUM VP system’s high-availability design philosophy, minimizing maintenance downtime during module replacement.
- Compact Form Factor: Lightweight at 220 g, optimized for dense marshalling cabinet installations without compromising thermal performance.
- Long-Term OEM Availability: As a genuine Yokogawa OEM component, the EC401-50 S3 is supported by Yokogawa’s global spare parts and lifecycle management program.
Industry & Equipment Applications
- Oil & Gas: Upstream wellhead automation, midstream pipeline SCADA, downstream refinery DCS expansions
- Petrochemical & Chemical: Reactor control systems, distillation column automation, batch process management
- LNG & Power Generation: Turbine control integration, boiler management systems, utility plant automation
- Pharmaceutical & Life Sciences: FDA-compliant process control, clean room environment monitoring
- Pulp & Paper / Mining: Continuous process lines requiring high-reliability fieldbus communication
System Integration & Compatible Parts
The EC401-50 S3 is designed to operate within the broader Yokogawa CENTUM VP ecosystem. Typical system integration involves the following related components:
- Yokogawa CENTUM VP Field Control Station (FCS) units
- Yokogawa AFF50 / AFF50D FOUNDATION Fieldbus interface modules
- H1 segment terminators and power conditioners (per IEC 61158-2)
- Yokogawa HART/FF field instruments (e.g., EJA series transmitters, YTA temperature transmitters)
- Yokogawa ProSafe-RS Safety Instrumented System (for SIL-rated loop integration)
When sourcing replacement or expansion modules, always verify the firmware revision compatibility with your existing CENTUM VP system version. Contact Konmask.com for cross-reference and compatibility verification support.
Our Quality Assurance Process
At Konmask.com, every Yokogawa EC401-50 S3 unit we supply undergoes a rigorous multi-stage verification process before shipment:
- Authenticity Verification: Visual inspection of OEM markings, serial number traceability, and packaging integrity checks against Yokogawa’s genuine product standards.
- Functional Pre-Check: Where applicable, basic power-on and communication response testing is performed.
- Condition Grading: Units are clearly graded as New (factory-sealed), Refurbished (tested & certified), or Used (inspected, as-is) — with full disclosure to the buyer.
- Secure Packaging: Anti-static packaging with moisture barrier and shock-absorbing materials for international air and sea freight.
- Documentation: Certificate of conformity, test report (where available), and packing list provided with every shipment.
How to Order
- Submit your inquiry via the Contact / RFQ form on this page, or email support@konmask.com.
- Provide your required quantity, preferred delivery timeline, and destination country.
- Our technical team will confirm availability, lead time, and issue a formal quotation within 1 business day.
- Upon PO confirmation, we arrange export documentation, customs clearance support, and door-to-door logistics.
- Tracking information and shipping documents (commercial invoice, packing list, COO) are provided upon dispatch.
Minimum Order Quantity: 1 unit | Lead Time: Subject to stock availability — contact us for current status.
Why Choose Konmask.com?
- ✅ Specialized in Industrial Automation: We focus exclusively on DCS, PLC, and fieldbus components — not a generalist marketplace.
- ✅ Global B2B Export Experience: Serving engineering firms, EPCs, and plant maintenance teams across Asia, the Middle East, Europe, and the Americas.
- ✅ Technical Pre-Sales Support: Our team includes engineers with hands-on CENTUM VP and FOUNDATION Fieldbus experience.
- ✅ Competitive Lead Times: Extensive supplier network enables fast sourcing of hard-to-find Yokogawa spare parts.
- ✅ Transparent Grading & Documentation: No surprises — full condition disclosure and traceable documentation on every order.
Frequently Asked Questions
- Q: Is the EC401-50 S3 compatible with CENTUM CS 3000?
- A: The EC401-50 S3 is designed for the CENTUM VP platform. Compatibility with CENTUM CS 3000 depends on the specific system configuration and firmware version. Please contact our technical team with your system details for a definitive compatibility assessment.
- Q: Can I use the EC401-50 S3 with non-Yokogawa FOUNDATION Fieldbus hosts?
- A: The EC401-50 S3 is optimized for Yokogawa CENTUM VP. While FOUNDATION Fieldbus is an open standard (IEC 61158), this module’s configuration and diagnostics are tightly integrated with Yokogawa’s engineering tools. Use with third-party hosts is not officially supported.
- Q: How many H1 devices can one EC401-50 S3 segment support?
- A: The number of devices per H1 segment depends on the power conditioner capacity, cable length, and device current consumption — typically up to 16 devices per segment under standard IEC 61158-2 conditions. Consult your CENTUM VP system engineering documentation for segment design guidelines.
- Q: Do you provide export documentation for international orders?
- A: Yes. Konmask.com provides full export documentation including commercial invoice, packing list, and certificate of origin. For countries requiring specific export licenses, we advise buyers in advance and assist with the process where possible.
- Q: What is the warranty on the EC401-50 S3 supplied by Konmask.com?
- A: Warranty terms vary by unit condition (New / Refurbished / Used). Please refer to the quotation issued by our team for specific warranty coverage applicable to your order.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
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