The ABB TB820-2V2 3BSE013209R1 is a critical ModuleBus modem in the ABB S800 I/O series, designed to enable fiber optic communication expansion for System 800xA distributed control systems (DCS). It features dual fiber optic ports and an electrical ModuleBus interface, serving as a bridge between electrical I/O modules and the optical ModuleBus network. This module supports up to 12 I/O modules per electrical ModuleBus segment and up to 7 clusters on the fiber optic ModuleBus, allowing flexible expansion of I/O stations beyond the 12-module limit of a single electrical bus. With galvanic isolation (2500 V AC) between electrical and optical interfaces, robust EMC performance, and a wide operating temperature range (-25°C to +70°C), it ensures reliable data transmission in harsh industrial environments with high electromagnetic interference, vibration, and long-distance installation requirements. Equipped with built-in supervisory functions for ModuleBus status and power supply monitoring, it provides real-time fault diagnostics and reporting, making it ideal for process industries such as oil & gas, chemical, power generation, and water treatment, where seamless I/O communication and system reliability are critical.

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