Siemens 6ES7422-1BH10-0AA0 Digital Output Module — Legacy Replacement. Siemens 6ES7422-1BH10-0AA0 is the exact manufacturer order number for a digital output module in the SIMATIC S7-400 portfolio. Siemens describes this exact reference as: SIMATIC S7-400, SM 422 DIGITAL OUTPUT MODULE, OPTIC. ISOLATED, 16 DO, 24V DC, 2A. The verified manufacturer lifecycle record is PM500:Discontinued Product or end of PLM & Support.