Siemens 6GK7243-7SX30-0XE0 Communication Processor. Siemens 6GK7243-7SX30-0XE0 is the exact manufacturer order number for a communication processor in the SIMATIC NET Industrial Communication portfolio. Siemens describes this exact reference as: Communications processor CP 1243-7 LTE US for Connection of SIMATIC S7-1200 to LTE network in American frequency band . The verified manufacturer lifecycle record is PM300: Active Product.