6GK7343-1EX21-0XE0 NEW ORIGINAL 6GK7343-1EX21-0XE0

The Siemens 6GK7343-1EX21-0XE0 is a CP 343-1 communication processor for the SIMATIC S7-300 platform. It connects the S7-300 PLC to Industrial Ethernet, providing PROFINET IO Controller functionality alongside standard Ethernet protocols including ISO, TCP/IP, and UDP . This module is the EX21 revision of the CP 343-1, distinguished from earlier EX11/EX20 models by the addition of IT functions (FTP server, HTTP diagnostics, Email, SNMP) and PG/OP multiplexing. It is a key spare for S7-300 systems that lack integrated PROFINET ports or require additional Ethernet connectivity for SCADA, HMI, and engineering stations .