Siemens 6GK7343-1EX21-0XE0 PROFIBUS DP Interface

Siemens 6GK7343-1EX21-0XE0 is a CP 343-1 communications processor that provides a single 100 Mbit/s Industrial Ethernet interface (RJ45) to connect SIMATIC S7-300 PLCs to PROFINET networks. The module supports PROFINET IO controller and PROFINET IO device roles within automation architectures, enabling Ethernet-based communication with PROFINET peripherals. It draws 5 V from the backplane and accepts a 24 V DC external supply via a 2‑pole plug-in terminal block, with C‑PLUG removable storage supported for configuration portability. Typical applications include linking S7-300 controllers to Industrial Ethernet and enabling PROFINET communications with peripheral devices.