Siemens 6GK7243-1BX50-0XE0 Communication Processor. Siemens 6GK7243-1BX50-0XE0 is the exact manufacturer order number for a communication processor in the SIMATIC NET Industrial Communication portfolio. Siemens describes this exact reference as: CP 1243-1 - communications processor for expanding the SIMATIC S7-1200 G2 communication functions: network separation telecontrol protocols DNP3 available soon: telecontrol protocol IEC 60870 and Telecontrol Basic Security (firewall, VPN) CloudConnect (MQTT). The verified manufacturer lifecycle record is PM300: Active Product.