Siemens 6ES7322-1BH81-0AA0 Digital Output Module — Legacy Replacement. Siemens 6ES7322-1BH81-0AA0 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, 16 DO, 24V DC, 0.5 A, 20 PIN. The verified manufacturer lifecycle record is PM500:Discontinued Product or end of PLM & Support.