Siemens 6ES7921-3BE10-0AA0 Industrial Automation Module — Legacy Replacement. Siemens 6ES7921-3BE10-0AA0 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 ********* plug (flat socket) according to DIN 41652, 16-pole, insulation displacement technology (8 units + 8 strain reliefs). The verified manufacturer lifecycle record is PM490:Start of final year of support.