Yokogawa EC401-10 ESB Bus Coupler Module 100% Brand NewESB Bus Coupler Module Overview General: The ESB Bus Coupler Module serves as a communication interface connecting the Field Control Unit and the Node Unit for the ESB Bus via the ESB bus. It can be integrated into various Field Control Units for FIO, such as AFV30S, AFV30D, AFV40S, AFV40D, A2FV50S, A2FV50D, A2FV70S, A2FV70D. Installing two modules in the Field Control Unit enables the configuration of a dual redundant ESB bus setup. Standard