Siemens 6ES7322-1FF81-0AA0 Digital Output Module — Legacy Replacement. Siemens 6ES7322-1FF81-0AA0 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, FOR EXPANDED TEMPERATURE RANGE 8 DO, 120/230V AC, 1A, 20 PIN. The verified manufacturer lifecycle record is PM500:Discontinued Product or end of PLM & Support.