6ES7321-7TH00-0AB0
SIMATIC S7/PCS7, digital input SM 321, 16 DI; 24 V DC, 1 x 40-pole, diagnostics-capable, for contacts (wired/ not wired), NAMUR encoder, 3/4-wire BERO, with chatter monitoring; Pulse extension, wire-break detection interface IM 153-2 required