The ABB UCD208A101 3BHE020018R0101 is an 8-channel digital input module designed for ABB Advant OCS distributed control systems, dedicated to acquiring dry contact or DC voltage digital signals from industrial field devices such as limit switches, pushbuttons, motor starters, and valve positioners. It supports 24 V DC input signals (sink/source configurable), with a response time of ≤ 1 ms per channel, ensuring real-time capture of fast-changing device states. Each channel features 2500 V AC galvanic isolation (channel-to-channel and channel-to-backplane), effectively preventing ground loops and electromagnetic interference in harsh industrial environments. Equipped with built-in diagnostic functions (open-circuit detection, overvoltage protection, module self-test), it provides real-time fault reporting to the Advant OCS controller, enhancing system reliability and reducing downtime. Designed for rack mounting in Advant OCS cabinets, it seamlessly integrates with ABB MasterBus 300 communication protocol, making it ideal for process industries including oil & gas, chemical processing, power generation, and pulp & paper, where reliable digital signal monitoring is critical for operational safety and efficiency.

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