R520 – DI890 Digital Input IS 8 ch Description Description R520 – DI890 Digital Input IS 8 ch Intrinsic Safety Interface. Individually galvanic isolated channels. Use Module Termination Unit TU890 or TU891. Related products ABB - 1.3 800xA 6.1 Hardware (3BSE088708/E)3BSE066490R1 Read more ABB - 1.3 800xA 6.1 Hardware (3BSE088708/E)3BSE082895R1 Read more ABB - 1.3 800xA 6.1 Hardware (3BSE088708/E)3BSE081637R1 Read more