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

Siemens CP343-1 Communications Processor (order 6GK7343-1EX21-0XE0) is a PROFIBUS DP interface that ties a SIMATIC S7-300 PLC to an Industrial Ethernet network via PROFInet IO Controllers. It provides a single 100 Mbit/s Industrial Ethernet interface (RJ45) and a 2‑pole plugable terminal block for DC power from the backplane bus (5 V), with C-PLUG removable media for configuration or data storage. The module supports S7 communication such as fetch/write and SEND/RECEIVE, with or without RFC1006, and enables Ethernet-based transport using ISO, TCP/IP, and UDP over the Industrial Ethernet connection. Designed for DIN rail backplane mounting within SIMATIC NET environments, it allows older S7-300 systems to interface with modern Ethernet networks while maintaining PROFIBUS DP connectivity to field devices. Typical applications include integrating S7-300 controllers with PROFIBUS DP devices on an Ethernet backbone, enabling remote diagnostics, data exchange, and IT-system integration without sacrificing legacy fieldbus connectivity.