SIMATIC-300: The modular PLC for innovative system solutions in the manufacturing industry
The connection of SIMATIC S7-300 programmable controllers via communications processors permits the direct integration of the controllers into Industrial Ethernet.
The communications processors have multi-protocol capability and support the following protocols:
- Programming device communication (PG/OP)
- S7 communication
- S5-compatible communication (SEND/RECEIVE, FETCH/WRITE)
- PROFINET
- IT

CP 343-1Lean: Connects even small applications to Industrial Ethernet
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The low-cost connection for programming devices and HMI devices, as well as for communication between S7 programmable controllers.

CP 343-1: The tried and tested, rugged, and reliable standard version, now also as PROFINET I/O device
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The efficient, reliable, and rugged communications processor that connects the S7-300 via Industrial Ethernet to the programming device, the HMI application or device, S5 and S7 programmable controllers, as well as the SINUMERIK powerline. As controller for the connection of PROFINET I/O components.

CP 343-1 Advanced: From PROFINET to IT communication
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In addition to the functionality of the CP 343-1, the CP 343-1 Advanced offers with the e-mail functions, http-based diagnostics and user-created web pages and thus optimally supports maintenance and quality assurance. The Internet functions, such as the FTP Client or JAVA, even permit the direct connection to the ERP level without the need for additional gateways.
Because of the two separate interfaces the CP is qualified for network seperation between Control- and Field-Level for e.g. better performance.
Therefore, for the S7-300, this CP is the bridge between the field level over PROFINET and the MES level.