YOKOGAWA EC402-50 ESB Bus Coupler Module | Replacement, Equivalent & Selection Guide
The YOKOGAWA EC402-50 is an ESB (Enhanced Signal Bus) Bus Coupler Module designed for use within YOKOGAWA’s CENTUM CS/CS3000/VP distributed control systems. It serves as the critical communication bridge between the ESB bus and field control stations, ensuring reliable, high-speed data transfer in demanding industrial environments. This page provides full technical specifications, compatible replacement options, and a structured selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
- Model / SKU: EC402-50
- Manufacturer: YOKOGAWA Electric Corporation
- Series: CENTUM CS / CS3000 / VP ESB Bus
- Module Type: ESB Bus Coupler Module
- Bus Interface: ESB (Enhanced Signal Bus)
- Power Supply: Supplied via backplane / ESB bus rail
- Weight: Approx. 240 g
- Mounting: YOKOGAWA standard field control station chassis
- Operating Temperature: 0 °C to 55 °C
- Storage Temperature: −25 °C to 70 °C
- Humidity: 5% to 95% RH (non-condensing)
- Compliance: CE, RoHS
- Country of Origin: Japan
Compatible Replacement & Equivalent Models
When the EC402-50 is discontinued, out of stock, or cost-prohibitive, the following models may serve as functional replacements or equivalents. Always verify firmware version, backplane slot compatibility, and system configuration before substitution.
| Model | Manufacturer | Compatibility Level | Notes |
|---|---|---|---|
| EC401-50 | YOKOGAWA | Direct predecessor | Earlier revision; verify firmware compatibility |
| EC403-50 | YOKOGAWA | Upgraded successor | Enhanced diagnostics; check chassis slot mapping |
| EC402-10 | YOKOGAWA | Same series, shorter cable | Different cable length variant (10 cm) |
| EB401-1 | YOKOGAWA | ESB Bus Node Unit | Used in conjunction with coupler; not a direct swap |
Note: Third-party or aftermarket equivalents are not recommended for safety-critical DCS loops. Contact Konmask for OEM-sourced units.
Why Choose the Original EC402-50
- Guaranteed Interoperability: Factory-validated for CENTUM CS3000 / VP — no configuration risk.
- Deterministic Bus Timing: Maintains precise scan cycle integrity critical for process control loops.
- Long Service Life: Rated for continuous 24/7 industrial operation.
- OEM Warranty & Traceability: Full serial number traceability and manufacturer warranty support.
- Reduced Commissioning Time: Plug-and-play replacement with existing CENTUM system configurations.
Typical Applications
- Oil & gas refinery DCS field control stations
- Chemical plant process automation networks
- Power generation plant control systems
- Pharmaceutical batch control environments
- Pulp & paper mill distributed control architectures
- Water treatment and utility SCADA/DCS hybrid systems
System Compatibility
- YOKOGAWA CENTUM CS (legacy)
- YOKOGAWA CENTUM CS3000 R3.x
- YOKOGAWA CENTUM VP R4.x / R5.x / R6.x
- ESB Bus field control station chassis (FCS)
Not compatible with: YOKOGAWA ProSafe-RS safety systems, STARDOM FCN/FCJ controllers, or Vnet/IP-only architectures without ESB bridge modules.
Selection Guide
- Step 1 – Confirm Bus Type: Verify your FCS uses ESB bus (not Vnet/IP or RIO bus).
- Step 2 – Check Slot Position: EC402-50 occupies a dedicated coupler slot. Confirm slot availability in your chassis.
- Step 3 – Cable Length: The “-50” suffix denotes a 50 cm ESB cable. For 10 cm, select EC402-10.
- Step 4 – Firmware Version: Ensure your CENTUM system firmware supports the EC402-50 revision per YOKOGAWA IM documentation.
- Step 5 – Redundancy: For redundant ESB bus configurations, two EC402-50 units are required per FCS node.
Quality Assurance & Sourcing
- All units sourced from authorized YOKOGAWA distributors or verified OEM surplus channels.
- Each module undergoes visual inspection, functional verification, and ESD-safe packaging before shipment.
- Certificates of conformance (CoC) and test reports available upon request.
- Lead time: In-stock units ship within 3–5 business days; sourced units within 2–4 weeks.
How to Order
- SKU: EC402-50 | Manufacturer: YOKOGAWA Electric Corporation
- Add to cart directly, or contact us for bulk pricing and availability confirmation.
- Email: support@konmask.com | Tel: +0086 19859288691
- We accept T/T bank transfer, PayPal, and major credit cards.
- Export documentation (commercial invoice, packing list, COO) provided for international orders.
Replacement & Compatibility FAQ
Q: Can the EC402-50 replace an EC401-50 directly?
A: In most CENTUM CS3000 systems, yes — verify the firmware version matrix in YOKOGAWA IM 33J01B10-01EN before swapping.
Q: Is the EC402-50 compatible with CENTUM VP R6?
A: Yes, supported up to R6.x. Confirm with your system integrator for site-specific configurations.
Q: What does the “-50” suffix mean?
A: It denotes the ESB cable length — 50 cm. Other variants include EC402-10 (10 cm).
Q: Can I use a third-party equivalent?
A: We strongly advise against it for safety-critical DCS applications. OEM units ensure deterministic bus timing and full system warranty compliance.
Q: Do you provide a warranty?
A: Yes — all units come with a 90-day functional warranty. Extended warranty options available upon request.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
