The ABB FI820F (3BDH000031R1) is a dual-channel serial fieldbus interface module for the Freelance AC 800F distributed control system, installed in the controller's F1–F4 communication slots alongside the CAN (FI810F), PROFIBUS (FI830F), and FF/HSE (FI840F) modules. The module features channel-to-CPU galvanic isolation and supports hot-swap replacement in redundant AC 800F configurations.
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