Siemens 6ES7321-7TH00-0AB0 Digital Input Module — Legacy Replacement. Siemens 6ES7321-7TH00-0AB0 is the exact manufacturer order number for a digital input module in the SIMATIC S7-300 portfolio. Siemens describes this exact reference as: ********** spare part ********* 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 stretching, open-circuit detection connection IM 153-2 HF or IM 153-4 HF possible. The verified manufacturer lifecycle record is PM410:Product cancellation.
********** spare part ********* 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 stretching, open-circuit detection connection IM 153-2 HF or IM 153-4 HF possible