Siemens 6ES7422-7BL00-0AB0 Digital Output Module — Legacy Replacement. Siemens 6ES7422-7BL00-0AB0 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, digital output SM 422, isolated 32 DO; 24 V DC, 0.5 A with 0.15 ms output delay, diagnostics. The verified manufacturer lifecycle record is PM400:Announcement of product phase-out.