Siemens 6GK1500-3AA10 Automation Connection Component. Siemens 6GK1500-3AA10 is the exact manufacturer order number for a automation connection component in the SIMATIC NET PC Communication portfolio. Siemens describes this exact reference as: PROFIBUS OBT; opt. bus terminal for connection of a PROFIBUS nodes without integr. opt. interface to the opt. PROFIBUS DP; without Simplex plug. The verified manufacturer lifecycle record is PM300: Active Product.