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GENERAL
The Yokogawa EC401-11 ESB Bus Coupler Module is a communication module designed to connect the Field Control Unit and the Node Unit via the ESB Bus.
This module can be installed in various Field Control Units, including AFV30S, AFV30D, AFV40S, AFV40D, A2FV50S, A2FV50D, A2FV70S, and A2FV70D.
Dual-redundant ESB Bus configurations can be achieved by installing two modules in the Field Control Unit for FIO.
STANDARD SPECIFICATIONS
- Function: ESB bus interface function
- Number of connectable units: Maximum 9 units (*1)
- Transmission speed: 128 Mbps (I/O module data transmission)
- Transmission distance: Maximum 10 meters
- Current consumption: 0.5 A
- Weight: Approximately 0.24 kg
(*1: The number of ANB10S, ANB10D, ANT401, ANT411, and ANT421 units that can be connected to EC401 is up to 9.)
If the ESB bus is non-redundant, the ESB Bus Coupler Module must be installed in the 7th slot of compatible units such as AFV30S, AFV30D, AFV40S, AFV40D, A2FV50S, A2FV50D, A2FV70S, and A2FV70D. Slot 8 must be covered with a dummy module.
For dual-redundant ESB bus configurations, modules need to be installed in both the 7th and 8th slots.
Only the style code S3 or later of EC401 can be combined with the processor module CP471.
REQUIREMENTS FOR USING SEM (Sequence of Events Manager)
To use SEM for Vnet/IP, EC401 should be style 2 or later. The style number is indicated on the component tag.
For more detailed information, please refer to the GS document titled "SEM Sequence of Events Manager" (GS 33J30D10-01EN).
EXTERNAL DIMENSION

Nominal Tolerances : When the reference dimension is over 0.5 mm and equal or less than 120 mm, its nominal tolerance is ± 0.8 mm, while its combination of nominal tolerance is ± 1.5 mm. When the reference dimension is over 120 mm, its nominal tolerance is in accordance with JEM 1459.
MODEL AND SUFFIX CODES
| Description | ||
| Model | EC401 | ESB Bus Coupler Module (for N-IO/FIO, 1-Port) |
| Suffix Codes | -5 | Standard type with no explosion protection |
| -E | Standard type with explosion protection | |
| 0 | Basic type | |
| 1 | With ISA Standard G3 option |
APPLICABLE STANDARDS
Refer to the GS “Integrated Production Control System CENTUM VP System Overview” (GS 33J01A10-01EN).
ORDERING INFORMATION
Specify the model and suffix code(s). For selecting the right products for explosion protection, please refer to TI 33Q01J30-01E without fail.
TRADEMARK ACKNOWLEDGMENT
The names of corporations, organizations, products and logos herein are either registered trademarks or trademarks of Yokogawa Electric Corporation and their respective holders.
Payment: T/T, Western Union.
Shipping port: Xiamen.
Lead time: Typically 1–3 working days after payment confirmation (subject to stock).
Worldwide delivery: We ship industrial automation parts to customers around the world. Freight is quoted with your RFQ.
F.A.Q.
Common questions about quotes, shipping, warranty and returnsClick Request a Quote on the product page and send us the part number, required quantity, and destination country. Our sales team will reply with current availability, pricing, and estimated delivery time.
In-stock items are normally prepared after payment and order confirmation. Most orders are dispatched from our warehouse in China, although the shipping location may vary depending on current stock.
Yes. We ship industrial automation parts to customers worldwide. Shipping cost and transit time depend on the destination, package weight, product size, and local import requirements.
We commonly use DHL, FedEx, UPS, and other international courier services. The carrier can be selected according to the destination, delivery speed, shipment size, and customer requirements.
Our products are generally covered by a 12-month warranty. Eligible products may also be returned under our 30-day refund policy. Please contact our team before returning any item to confirm the applicable terms and return instructions.
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