Siemens 6ES7953-8LM31-0AA0 Industrial Automation Module — Legacy Replacement. Siemens 6ES7953-8LM31-0AA0 is the exact manufacturer order number for a industrial automation module in the SIMATIC S7-300 Connection System portfolio. Siemens describes this exact reference as: *** Spare part *** SIMATIC S7, micro memory card for S7-300/C7/ET 200, 3, 3V Nflash, 4 MB. The verified manufacturer lifecycle record is PM500:Discontinued Product or end of PLM & Support.