Product Description

The EC402-50 S1 is a high-speed ESB Bus Coupler Module designed for Yokogawa’s N-IO and FIO architectures within the CENTUM VP Distributed Control System (DCS). Serving as the primary master interface for the ESB bus, this module enables the Field Control Unit (FCU) to communicate with multiple expansion node units at a high transmission speed of 128 Mbps, ensuring real-time refresh of high-density I/O data.

Engineered for scalable system architectures, the EC402-50 S1 supports up to 18 nodes in a split-bus configuration (9 upper + 9 lower) over a total transmission distance of 20 meters. The module combines high reliability, low power consumption, and robust industrial design, making it suitable for both new system installations and ongoing maintenance of existing CENTUM VP plants.

Technical Specifications

Application Scenarios

• Centralized connection of remote I/O nodes in petrochemical, power, and pharmaceutical facilities

• High-speed data integration for high-density I/O modules, enabling fast PID loops and critical control functions

• Facilitates distributed hardware layouts for simplified maintenance and cable management

• Ideal for large-scale industrial operations requiring reliable, low-latency data transfer

Frequently Asked Questions

Q1: What is the significance of the 128 Mbps transmission speed?
A: The 128 Mbps bus speed allows real-time communication from high-density I/O modules without bottlenecks, ensuring timely updates for fast-acting PID control loops and safety-critical processes.

Q2: Can I use standard Ethernet cables for the ESB bus?
A: No. The EC402-50 S1 requires dedicated, high-shielded Yokogawa ESB cables (e.g., YCB301). Standard Ethernet cabling may cause data loss, interference, or system instability due to the high-frequency 128 Mbps transmission.