Siemens 6ES7322-1HF20-0AA0 Digital Output Module — Legacy Replacement. Siemens 6ES7322-1HF20-0AA0 is the exact manufacturer order number for a digital output module in the SIMATIC S7-300 portfolio. Siemens describes this exact reference as: SIMATIC S7-300, DIGITAL OUTPUT SM 322, OPTICALLY ISOLATED, 8 DO (RELAY OUTPUTS), 40 PIN, 24V DC, 120 - 230V AC, 5A WITH INTEGR. SNUBBER F. IND. LOADS. The verified manufacturer lifecycle record is PM500:Discontinued Product or end of PLM & Support.