Siemens 6GK7443-5DX05-0XE0 Communication Processor. Siemens 6GK7443-5DX05-0XE0 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 443-5 Extended for connection of SIMATIC S7-400 to PROFIBUS DP, S5-compatible, PG/OP and S7 communication. The verified manufacturer lifecycle record is PM300: Active Product.