SIPLUS PCS 7 SM 321 16DE for medial exposure with conformal coating based on 6ES7321-7TH00-0AB0 . Digital input '16 DI DC 24V, 1x 40-pin,' diagnostics capable, for contacts (wired/unwired), NAMUR encoder, 3/4-wire BERO, with FLATTER 'monitoring, PULSE EXTENSION, wire break detection, IM 153-2 connection required SIPLUS PCS 7 SM 321 16DI for media exposure with conformal coating based on 6ES7321-7TH00-0AB0, Digital input '16 DI, DC 24V, 1x 40-pin,' diagnostics capable, for contacts (wired/unwired), NAMUR encoder, 3/4-wire BERO, with FLATTER 'monitoring, PULSE EXTENSION, wire break detection, IM 153-2 connection required 153-2 required SIPLUS PCS7 digital module input SM 321, DI 16xDC 24 V with conformal coating based on 6ES7321-7TH00-0AB0